[1] Med Coll Georgia, Dept Urol, Augusta, GA 30912 USA
[2] Univ Hosp, Sexol Unit, Uppsala, Sweden
[3] Erasmus Univ, Acad Hosp Rotterdam Dijkzigt, Dept Urol, NL-3015 GD Rotterdam, Netherlands
[4] Univ Chicago, Chicago, IL 60637 USA
[5] Carlos Haya Hosp, Dept Urol, Malaga, Spain