Lee CH, Shin JH, Ahn GJ, Kang KK, Ahn BO, Yoo M. Udenafil enhances the recovery of erectile function and ameliorates the pathophysiological consequences of cavernous nerve resection. J Sex Med. 2010 Jul;7(7):2564–71. doi: 10.1111/j.1743-6109.2010.01858.x. PMID: 20524975.