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Steensma TD, van der Ende J, Verhulst FC, Cohen-Kettenis PT.Steensma TD, et al.J Sex Med. 2013 Nov;10(11):2723-33. doi: 10.1111/j.1743-6109.2012.02701.x. Epub 2012 Mar 28.J Sex Med. 2013.PMID: 22458332