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Vallinga MS, Spoelstra SK, Hemel IL, van de Wiel HB, Weijmar Schultz WC.Vallinga MS, et al. Among authors: spoelstra sk.J Sex Med. 2015 Jan;12(1):228-37. doi: 10.1111/jsm.12740. Epub 2014 Nov 12.J Sex Med. 2015.PMID: 25388372