Age-related changes in general and sexual health in middle-aged and older men: results from the European Male Ageing Study (EMAS).
Corona G, Lee DM, Forti G, O'Connor DB, Maggi M, O'Neill TW, Pendleton N, Bartfai G, Boonen S, Casanueva FF, et al. J Sex Med. 2010 Apr; 7(4 Pt 1):1362-80. Epub 2009 Nov 19.