1. Statistical abstract of the United States 1992,1992
2. Impotence and its medical and psychosocial correlates: Results of the Massachusetts Male Aging Study;Feldman;J Urol,1994
3. Prevalence of erectile dysfunction among young adults: Results of a large-scale survey;Heruti;J Sex Med,2004
4. Lewis RW, Fugl-Meyer KS, Bosch R, Fugl-Meyer AR, Laumann EO, Lizza E, Martin-Morales A. Definitions, classification, and epidemiology of sexual dysfunction. In: Lue T, Giuliano F, Khoury S, Montorsi F, Rosen R, eds. Sexual medicine, volume 1: Sexual dysfunction in men and women. Available at: http://www.issm.info. Accessed October 19, 2006.
5. Prevalence of erectile dysfunction: A systematic review of population-based studies;Prins;Int J Impot Res,2002