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World Professional Association for Transgender Health

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World Professional Association for Transgender Health
AbbreviationWPATH
FormationSeptember 1979; 45 years ago (1979-09)
TypeNGO
94-2675140[1]
Legal status501(c)(3)[1]
PurposeTo promote evidence-based care, education, research, advocacy, public policy, and respect in transgender health.[2]
HeadquartersEast Dundee, Illinois, U.S.
ProductsStandards of Care for the Health of Transsexual, Transgender, and Gender Nonconforming People
Membership (2021)
2,700[3]
Walter Pierre Bouman[4]
Marci Bowers[4]
Asa Radix[4]
Loren Schechter[4]
Revenue (2016)
$1,245,915[2]
Expenses (2016)$1,144,284[2]
Employees (2016)
0[2]
Websitewww.wpath.org Edit this at Wikidata
Formerly called
Harry Benjamin International Gender Dysphoria Association

The World Professional Association for Transgender Health (WPATH), formerly the Harry Benjamin International Gender Dysphoria Association (HBIGDA), is a professional organization devoted to the understanding and treatment of gender identity and gender dysphoria, and creating standardized treatment for transgender and gender variant people. WPATH was founded in 1979 and named HBIGDA in honor of Harry Benjamin during a period where there was no clinical consensus on how and when to provide gender-affirming care. WPATH is mostly known for the Standards of Care for the Health of Transgender and Gender Diverse People (SOC).

Standards of Care

[edit]

WPATH develops,[5] publishes and reviews guidelines for persons with gender dysphoria, under the name of Standards of Care for the Health of Transgender and Gender Diverse People, the overall goal of the SOC is to provide clinical guidance for health professionals to assist transgender, and gender nonconforming people with safe and effective pathways to achieving lasting personal comfort with their gendered selves, in order to maximize their overall health, psychological well-being, and self-fulfillment.[6] To keep up with increasing scientific evidence, WPATH periodically commissions an update to the Standards of Care and the WPATH Guideline Steering Committee oversees the guideline development process.[5] The first version of the Standards of Care were published in 1979.[7] Versions were released in 1979 (1st),[8] 1980 (2nd),[9] 1981 (3rd),[10][11] 1990 (4th),[12] 1998 (5th),[13] 2001 (6th),[14][15] and 2012 (7th).[16] WPATH released Version 8, the latest edition, in 2022;[17] it is described as being based upon a “more rigorous and methodological evidence-based approach than previous versions.”[5]

SOC is an internationally accepted and influential document outlining how to provide patients with transition related care. Early versions of the SOC focused gender transition towards psychologists and psychiatrists and framed transgender identity as a mental illness.[18][19] Beginning in approximately 2010, with pushing from trans activists[20] the WPATH began publicly advocating the depsychopathologization of transgender identities in the 7th version of the SOC.[21][22]

History

[edit]

Background

[edit]

Medical treatment for gender dysphoria was publicized in the early 1950s by accounts such as those of Christine Jorgensen.[23] During this period, the majority of literature on gender diversity was pathologizing, positing dysfunctional families as the causes of dysphoria and recommending reparative therapy and psychoanalysis, such as Robert Stoller's work. Others such as George Rekers and Ole Ivar Lovaas recommended behavioral treatments to extinguish cross-sex identification and reinforce gender-normative behaviors.[23] Knowledge on various aspects of transition related care had existed for decades, but there was no clinical consensus on the care pathways for transgender people.[24]

In 1966, Harry Benjamin published The Transsexual Phenomenon, arguing that since there was no cure for transsexualism, it was in the best interests of transsexuals and society to aid in sex reassignment and in the same year the Johns Hopkins Gender Clinic was opened by John Money.[23] In 1969, Reed Erickson, a wealthy transgender man who played a large role in funding research and clinics for trans healthcare through the Erickson Educational Foundation, funded Richard Green and Money's book Transsexualism and Sex Reassignment, a multidisciplinary volume exploring instructions on medical care as well as social and clinical aspects, which was dedicated to Benjamin.[24][23] The same year, he funded the 1st International Symposium on Gender Identity in London.[24] The 4th conference, taking place in 1975, was the first to use Benjamin's name in the title.[23]

1979-2000

[edit]

The Harry Benjamin International Gender Dysphoria Association and Standards of Care (SOC) were conceived during the 5th International Gender Dysphoria Symposium (IGDS) in 1977.[25] The organization was named in honor of Benjamin[26] and supported a mixture of psychological and medical treatment.[27][28] The founding committee was entirely American and consisted of Jack Berger, Richard Green, Donald R. Laub, Charles Reynolds Jr., Paul A. Walker, Leo Wollman, and transgender activist Jude Patton with Walker serving as president; The first SOC committee included all founding committee members with the exception of Patton, a vote by attendees having opposed a "consumer" board member.[25] The Articles of Incorporation were approved in 1979 at the 6th IGDS and HBIGDA was legally incorporated 7 months later.[25]

The initial Standards of Care, The hormonal and surgical sex reassignment of gender dysphoric persons, were published in 1979 and served both as clinical guidelines for treating patients and to protect those who provided the treatments.[27] Versions 2, 3, and 4 of the SOC were published in 1980, 1981 and 1990 respectively under the same name with few changes.[25][23][24] These versions of the SOC followed the gatekeeping model laid out by Benjamin, where clinicians set strict eligibility requirements, requiring evaluations from separate mental health professionals and compulsory psychotherapy.[23][28][24] WPATH played a large role in the addition of "Gender Identity Disorder" to the DSM-III in 1980.[25] These versions used the DSM-III's criteria for the diagnoses of "Transsexualism" and "Gender Identity Disorder of Childhood", which had largely been authored by Richard Green.[24] This led to feedback loops in research where the diagnostic criteria were thought correct since transgender people provided the narratives expected of them to access care.[24]

In the 1990's, WPATH was struggling to operate due to criticisms of their SOC in the trans community such as the requirement of the real life test, [29] where patients had to socially transition for up to a year prior to hormones. These critiques developed into a trans-led Advocacy and Liason committee, marking the first time trans people were officially and actively consulted regarding their treatment.[30] The 5th version, published in 1998, was titled the "Standards of Care for Gender Identity Disorders" to be consistent with the DSM-III. It recommended but did not require psychotherapy and stated that while GID was a mental disorder, that was not a license for stigma.[23]

Changes to the World Professional Association for Transgender Health (WPATH) standards of care around gender affirming medical and surgical treatments over time.

2001 - present

[edit]

The Standards of Care (SOC) 6 was published in 2001 and offered more flexibility and individualized care but continued to use the phrase "gender identity disorder". At the same time transgender people increasingly complained of having to "jump through hoops".[23] SOC 6 also did not include significant changes to the tasks mental health professionals were required to take or in the general recommendations for content of the letters of readiness.[31] An important change in the eligibility criteria for GAH allowed providers to prescribe hormones even if patients had not undergone RLT or psychotherapy if it was for harm reduction purposes.[31] A notable change in version six separated the eligibility and readiness criteria for top and bottom surgery allowing some patients,[32][full citation needed] particularly individuals assigned female at birth, to receive a mastectomy.[31][33]

In 2006, the organization changed its name from the Harry Benjamin International Gender Dysphoria Association (HBIGDA) to the World Professional Association for Transgender Health (WPATH).[23][34] In 2007, Stephen Whittle became the first transgender president of the organization.[24]

In 2010, WPATH published the "depath statement", urging the "depsychopathologisation of gender variance worldwide" by governments and medical bodies.[23][35] Shortly afterwards it released the "Identity Recognition Statement",[36] urging governmental and medical bodies to endorse gender self-identification and no longer require surgery or sterilization as a prerequisite.[23]

The SOC 7, published in 2011, was more evidence-based than the previous versions and first to include an international advisory committee of transgender community leaders. It changed the name to the "Standards of Care for the Health of Transsexual, Transgender, and Gender-Nonconforming People", began to use the phrase "gender dysphoria", and marked a shift from conceiving gender as a binary to a spectrum.[24][23] Differences between the 6th and the 7th versions were significant with the 7th version of the SOC including gender affirming care in female-to-male persons.[6] The updated SOC also had a significant departure from previous versions.[6] Including being the first version to include references, changes in guidelines where not everyone with gender concerns requires a diagnosis,[37][38] replacing the requirement of the real life test and psychotherapy prior to hormone treatment or surgery with “persistent well documented gender dysphoria”,[31][39] criteria for hysterectomy or orchiectomy treatment,[40] and an expansion of the effects of hormone therapy.[6] WPATH acknowledged the importance and changes in the 7th SOC saying that “Changes in this version are based upon significant cultural shifts, advances in clinical knowledge, and appreciation of the many health care issues that can arise for transsexual, transgender, and gender nonconforming people beyond hormone therapy and surgery”.[16]

In 2022 the current edition of the Standards of Care 8 was published.[17] The guidelines note that the complexity of the assessment process may differ from patient to patient, based on the type of gender affirming care requested and the specific characteristics of the patient.[31] The updates to SOC 8 shifted the ethical focus of evaluations toward one of shared decision making and informed consent by removing the requirement of a second letter from a mental health professional and the requirement that the provider must have a doctoral level degree.[17][31] Changes in this edition included a shift away from requiring multiple letters from mental health professionals for surgery,[41][42] introduces the term gender incongruence,[43] and the treatment of adolescents.[42][44]

Organization

[edit]

Membership

[edit]

Professionals include anyone working in disciplines such as medicine, psychology, law, social work, counseling, psychotherapy, family studies, sociology, anthropology, speech and voice therapy and sexology. Non-professionals may also join, paying the same membership fee, but without voting privileges.[45] The organization is funded by its membership and by donations and grants from non-commercial sources.[46] The current president of the organization is Marci Bowers.[47]

Regional organizations

[edit]

WPATH is affiliated with several regional organizations, including the European Professional Association for Transgender Health, the United States Professional Association for Transgender Health and ASIAPATH.[48]

References

[edit]
  1. ^ a b "World Professional Association For Transgender Health Archived 2018-10-04 at the Wayback Machine". Tax Exempt Organization Search. Internal Revenue Service. Retrieved October 4, 2018.
  2. ^ a b c d "Form 990: Return of Organization Exempt from Income Tax Archived 2022-06-18 at the Wayback Machine". World Professional Association for Transgender Health. Guidestar. December 31, 2016.
  3. ^ Bowers, Marci (January 11, 2021). Dear WPATH Membership (PDF). WPATH. Archived (PDF) from the original on November 14, 2023. Retrieved November 14, 2023. WPATH has seen significant growth in its membership and programming over the past year, now with more than 2700 members and 49 countries represented.
  4. ^ a b c d "Executive Committee and Board of Directors". World Professional Association for Transgender Health. Archived from the original on October 4, 2018. Retrieved March 3, 2021.
  5. ^ a b c Coleman, E.; Radix, A. E.; Bouman, W. P.; Brown, G. R.; et al. (August 19, 2022). "Standards of Care for the Health of Transgender and Gender Diverse People, Version 8". International Journal of Transgender Health. 23 (sup1): S1–S259. doi:10.1080/26895269.2022.2100644. ISSN 2689-5269. PMC 9553112. PMID 36238954.
  6. ^ a b c d Selvaggi, Gennaro; Dhejne, Cecilia; Landen, Mikael; Elander, Anna (2012). "The 2011 WPATH Standards of Care and Penile Reconstruction in Female-to-Male Transsexual Individuals". Advances in Urology. 2012: 1–13. doi:10.1155/2012/581712. ISSN 1687-6369. PMC 3359659. PMID 22654902.
  7. ^ Figures, K. (2007). "Harry Benjamin International Gender Dysphoria Association Is Founded". In Faderman, Lillian; Retter, Yolanda (eds.). Great Events from History: Gay, Lesbian, Bisexual, and Transgender Events, 1848-2006. Salem Press. ISBN 978-1-58765-263-9.
  8. ^ Walker, P. A.; Berger, J. C.; Green, R.; Laub, D. R.; et al. (February 13, 1979), Standards of Care: The Hormonal and Surgical Sex Reassignment of Gender Dysphoric Persons (1 ed.), Palo Alto, California: The Harry Benjamin International Gender Dysphoria Association
  9. ^ Walker, P. A.; Berger, J. C.; Green, R.; Laub, D. R.; et al. (January 20, 1980), Standards of Care: The Hormonal and Surgical Sex Reassignment of Gender Dysphoric Persons (2 ed.), Stanford, California: The Harry Benjamin International Gender Dysphoria Association
  10. ^ Walker, P. A.; Berger, J. C.; Green, R.; Laub, D. R.; et al. (March 9, 1981), Standards of Care: The Hormonal and Surgical Sex Reassignment of Gender Dysphoric Persons (3 ed.), San Francisco, California: The Harry Benjamin International Gender Dysphoria Association
  11. ^ Walker, P. A.; Berger, J. C.; Green, R.; Laub, D. R.; et al. (February 1985). "Standards of Care: The Hormonal and Surgical Sex Reassignment of Gender Dysphoric Persons [3rd Edition]". Archives of Sexual Behavior. 14 (1): 79–90. doi:10.1007/BF01541354. ISSN 0004-0002. PMID 3977585.
  12. ^ Walker, P. A.; Berger, J. C.; Green, R.; Laub, D. R.; et al. (January 25, 1990), Standards of Care: The Hormonal and Surgical Sex Reassignment of Gender Dysphoric Persons (4 ed.), San Francisco, California: The Harry Benjamin International Gender Dysphoria Association, archived from the original on February 27, 2004
  13. ^ Levine, S. B.; Brown, G.; Coleman, E.; Cohen-Kettenis, P.; et al. (June 1998). "The Standards of Care for Gender Identity Disorders [5th Edition]". International Journal of Transgenderism. 2 (2). Archived from the original on December 5, 1998.
  14. ^ Meyer, W.; Bockting, W. O.; Cohen-Kettenis, P.; Coleman, E.; et al. (February 2001). "The Standards of Care for Gender Identity Disorders – Sixth Version". International Journal of Transgenderism. 5 (1). Archived from the original on July 9, 2001.
  15. ^ Meyer, W.; Bockting, W. O.; Cohen-Kettenis, P.; Coleman, E.; et al. (2001). "The Standards of Care for Gender Identity Disorders, Sixth Version" (PDF). Journal of Psychology & Human Sexuality. 13 (1): 1–30. doi:10.1300/J056v13n01_01. Archived from the original (PDF) on March 17, 2024.
  16. ^ a b Coleman, Eli; Bockting, Walter; Botzer, Marsha; Cohen-Kettenis, Peggy; et al. Standards of Care for the Health of Transsexual, Transgender, and Gender-Nonconforming People, Version 7 (PDF) (Report). World Professional Association for Transgender Health. Archived from the original (PDF) on March 27, 2018. Retrieved August 25, 2024.
  17. ^ a b c Coleman, E.; Radix, A. E.; Bouman, W. P.; Brown, G. R.; et al. (August 19, 2022). "Standards of Care for the Health of Transgender and Gender Diverse People, Version 8". International Journal of Transgender Health. 23 (sup1): S1–S259. doi:10.1080/26895269.2022.2100644. ISSN 2689-5269. PMC 9553112. PMID 36238954. S2CID 252127302.
  18. ^ Midence, Kenny; Hargreaves, Isabel (1997). "Psychosocial Adjustment in Male-to-Female Transsexuals: An Overview of the Research Evidence". The Journal of Psychology. 131 (6): 602–614. doi:10.1080/00223989709603842. ISSN 0022-3980. PMID 9390414. Archived from the original on June 19, 2022. Retrieved August 26, 2024.
  19. ^ Levine, Stephen B.; Brown, George R.; Coleman, Eli; Cohen-Kettenis, Peggy T.; et al. (December 6, 1999). "The Standards of Care for Gender Identity Disorders". Journal of Psychology & Human Sexuality. 11 (2): 1–34. doi:10.1300/J056v11n02_01. ISSN 0890-7064. Archived from the original on May 12, 2024. Retrieved August 26, 2024.
  20. ^ Rosenthal, G. Samantha (February 12, 2024). "Pseudoscience Has Long Been Used to Oppress Transgender People". Scientific American. Retrieved August 26, 2024.
  21. ^ Corneil, Trevor A.; Eisfeld, Justus H.; Botzer, Marsha (September 20, 2010). "Proposed Changes to Diagnoses Related to Gender Identity in the DSM : A World Professional Association for Transgender Health Consensus Paper Regarding the Potential Impact on Access to Health Care for Transgender Persons". International Journal of Transgenderism. 12 (2): 107–114. doi:10.1080/15532739.2010.509205. ISSN 1553-2739.
  22. ^ Monstrey, Stan; Vercruysse, Herman; De Cuypere, Griet (August 31, 2009). "Is Gender Reassignment Surgery Evidence Based? Recommendation for the Seventh Version of the WPATH Standards of Care". International Journal of Transgenderism. 11 (3): 206–214. doi:10.1080/15532730903383799. ISSN 1553-2739.
  23. ^ a b c d e f g h i j k l m Fraser, Lin (2015). "Gender Dysphoria: Definition and Evolution Through the Years". In Trombetta, Carlo; Liguori, Giovanni; Bertolotto, Michele (eds.). Management of Gender Dysphoria: A Multidisciplinary Approach. Springer Milan. pp. 19–31. doi:10.1007/978-88-470-5696-1_3. ISBN 978-88-470-5696-1.
  24. ^ a b c d e f g h i Riggs, Damien W.; Pearce, Ruth; Pfeffer, Carla A.; Hines, Sally; et al. (2019). "Transnormativity in the psy disciplines: Constructing pathology in the Diagnostic and Statistical Manual of Mental Disorders and Standards of Care". American Psychologist. 74 (8): 912–924. doi:10.1037/amp0000545. ISSN 1935-990X. PMID 31697127.
  25. ^ a b c d e Matte, Nicholas; Devor, Aaron H.; Vladicka, Theresa (May 12, 2009). "Nomenclature in the World Professional Association for Transgender Health's Standards of Care : Background and Recommendations". International Journal of Transgenderism. 11 (1): 42–52. doi:10.1080/15532730902799979. ISSN 1553-2739.
  26. ^ Allee, Kegan M. "Harry Benjamin International Gender Dysphoria Association". Encyclopedia of gender and society. Vol. 1. SAGE. p. 402. ISBN 978-1-4129-0916-7.
  27. ^ a b Dewey, Jodie M. (2015). "Challenges of implementing collaborative models of decision making with trans-identified patients". Health Expectations. 18 (5): 1508–1518. doi:10.1111/hex.12133. ISSN 1369-6513. PMC 5060816. PMID 24102959.
  28. ^ a b Fraser, Lin; Knudson, Gail (March 1, 2017). "Past and Future Challenges Associated with Standards of Care for Gender Transitioning Clients". Psychiatric Clinics of North America. Clinical Issues and Affirmative Treatment with Transgender Clients. 40 (1): 15–27. doi:10.1016/j.psc.2016.10.012. ISSN 0193-953X. PMID 28159141.
  29. ^ Lawrence, Anne (November 4, 2001). SRS Without a One Year RLE: Still No Regrets. XVII Harry Benjamin International Symposium on Gender Dysphoria. Galveston, Texas. Archived from the original on June 23, 2018.
  30. ^ "Trans Care within and against the Medical-Industrial Complex". manifold.umn.edu.
  31. ^ a b c d e f Amengual, Travis; Kunstman, Kaitlyn; Lloyd, R. Brett; Janssen, Aron; et al. (October 20, 2022). "Readiness assessments for gender-affirming surgical treatments: A systematic scoping review of historical practices and changing ethical considerations". Frontiers in Psychiatry. 13. doi:10.3389/fpsyt.2022.1006024. ISSN 1664-0640. PMC 9630738. PMID 36339880.
  32. ^ Levine, Stephen; Althof, Stanley; Risen, Candace, eds. (2011). Handbook of Clinical Sexuality for Mental Health Professionals. New York, New York, United States of America: Taylor & Francis.
  33. ^ Meyer, Walter; Bockting, Walter O.; Cohen-Kettenis, Peggy; Coleman, Eli; et al. (April 11, 2002). "The Harry Benjamin International Gender Dysphoria Association's Standards of Care for Gender Identity Disorders, Sixth Version". Journal of Psychology & Human Sexuality. 13 (1): 1–30. doi:10.1300/j056v13n01_01. ISSN 0890-7064.
  34. ^ Cole, Althea (March 10, 2024). "Poor standards of trans health care threaten trans health". The Gazette. Vol. 142, no. 61. pp. C10. Retrieved August 25, 2024.
  35. ^ "WPATH "depath statement"" (PDF) (Press release). WPATH. May 26, 2010.
  36. ^ de Graaf, Nastasja M; Carmichael, Polly (2019). "Reflections on emerging trends in clinical work with gender diverse children and adolescents". Clinical Child Psychology and Psychiatry. 24 (2): 353–364. doi:10.1177/1359104518812924. ISSN 1359-1045. PMID 30482053. Archived from the original on September 5, 2024. Retrieved August 27, 2024.
  37. ^ Dickey, Lore; Singh, Anneliese A. (2017). "Physical health concerns related to medical transitions for transgender and gender nonconforming clients". In DeBord, Kurt A.; Fischer, Ann R.; Bieschke, Kathleen J.; Perez, Ruperto M. (eds.). Handbook of sexual orientation and gender diversity in counseling and psychotherapy. Washington: American Psychological Association. pp. 417–438. doi:10.1037/15959-017. ISBN 978-1-4338-2306-0. Archived from the original on September 5, 2024. Retrieved August 27, 2024.
  38. ^ Mallory, Allen; Brown, Jennifer; Conner, Stacy; Henry, Una (2017). "Finding What Works: New Clinicians' Use of Standards of Care With Transgender Clients". The American Journal of Family Therapy. 45 (1): 27–36. doi:10.1080/01926187.2016.1223563. ISSN 0192-6187. Archived from the original on September 5, 2024. Retrieved August 27, 2024.
  39. ^ Meyer, Walter J. (July 20, 2009). "World Professional Association for Transgender Health's Standards of Care Requirements of Hormone Therapy for Adults with Gender Identity Disorder". International Journal of Transgenderism. 11 (2): 127–132. doi:10.1080/15532730903008065. ISSN 1553-2739. Archived from the original on February 9, 2024. Retrieved August 27, 2024.
  40. ^ Colebunders, Britt; De Cuypere, Griet; Monstrey, Stan (October 2, 2015). "New Criteria for Sex Reassignment Surgery: WPATH Standards of Care, Version 7, Revisited". International Journal of Transgenderism. 16 (4): 222–233. doi:10.1080/15532739.2015.1081086. ISSN 1553-2739. Archived from the original on April 10, 2024. Retrieved August 27, 2024.
  41. ^ Wu, Catherine A.; Keuroghlian, Alex S. (March 1, 2023). "Moving Beyond Psychiatric Gatekeeping for Gender-Affirming Surgery". JAMA Surgery. 158 (3): 231–232. doi:10.1001/jamasurg.2022.5828. ISSN 2168-6254. PMID 36515959. Archived from the original on August 27, 2024. Retrieved August 27, 2024.
  42. ^ a b Poteat, Tonia; Davis, Andrew M.; Gonzalez, Alex (June 6, 2023). "Standards of Care for Transgender and Gender Diverse People". JAMA. 329 (21): 1872–1874. doi:10.1001/jama.2023.8121. ISSN 0098-7484. PMID 37200007. Archived from the original on August 27, 2024. Retrieved August 27, 2024.
  43. ^ Patel, Ashraf A.; Marquez, Jessica L.; Agarwal, Cori A.; Gallagher, Sidhbh; et al. (November 7, 2023). "A Summary of WPATH Standards of Care 8 th Edition for Gender Affirming Plastic Surgery". Plastic & Reconstructive Surgery. doi:10.1097/PRS.0000000000011192. ISSN 0032-1052. PMID 37943690. Archived from the original on September 5, 2024. Retrieved August 27, 2024.
  44. ^ Leibowitz, Scott F. (2023). "Assessment of Transgender and Gender-Diverse Adolescents". Child and Adolescent Psychiatric Clinics of North America. 32 (4): 707–718. doi:10.1016/j.chc.2023.05.009. PMID 37739629. Archived from the original on July 10, 2024. Retrieved August 27, 2024.
  45. ^ "Membership Information". WPATH. Archived from the original on June 12, 2018. Retrieved June 9, 2018.
  46. ^ "WPATH". Archived from the original on November 3, 2020. Retrieved June 9, 2018.
  47. ^ "Transcript: Dr. Marci Bowers on "Face the Nation," July 23, 2023 - CBS News". www.cbsnews.com. July 23, 2023. Archived from the original on August 26, 2024. Retrieved August 26, 2024.
  48. ^ Cross, Alexander (2023). The WPATH Standards of Care: Their History and Importance in Advocating for Transgender Health (BA thesis). University of Maine. Archived from the original on August 26, 2024. Retrieved August 25, 2024.

 This article incorporates text from this source, which is by Gennaro Selvaggi, Cecilia Dhejne, Mikael Landen, Anna Elanderbob available under the CC BY 3.0 license.

 This article incorporates text from this source, which is by Travis Amengual, Kaitlyn Kunstman, R. Brett Lloyd, Aron Janssen, Annie B. Wescott available under the CC BY 4.0 license.