The other reference to the Rat Park study in this article is fine. The original summary that I removed is an incorrect rephrasing of the 1978 study, which can be found http://download.springer.com/static/pdf/674/art%253A10.1007%252FBF00426903.pdf?auth66=1386426307_2f1a11ee1fd744d5faef7f60ca858ae9&ext=.pdf
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