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Cohen-Kettenis PT, Delemarre-van de Waal HA, Gooren LJ.Cohen-Kettenis PT, et al.J Sex Med. 2008 Aug;5(8):1892-7. doi: 10.1111/j.1743-6109.2008.00870.x. Epub 2008 Jun 28.J Sex Med. 2008.PMID: 18564158