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This measurement scale was first introduced by James Hamilton in the 1950s and later revised and updated by O'Tar Norwood in the 1970s. It is sometimes referred to as the Norwood–Hamilton scale or simply the Norwood scale.
- Ludwig scale of female baldness
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- Gupta, M; Mysore, V (2016). "Classifications of Patterned Hair Loss: A Review". Journal of Cutaneous and Aesthetic Surgery. 9 (1): 3–12. doi:10.4103/0974-2077.178536. PMC 4812885. PMID 27081243.
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