[1] Univ Munster, Inst Reprod Med, D-4400 Munster, Germany
[2] Harbor UCLA Med Ctr, Div Endocrinol, Torrance, CA 90509 USA
[3] Los Angeles Biomed Res Inst, Torrance, CA USA
[4] Univ Halle Wittenberg, Dept Urol, Androl Unit, Halle An Der Saale, Germany
[5] Free Univ Amsterdam Hosp, Dept Endocrinol Androl, Amsterdam, Netherlands
[6] Acad Ziekenhuis, Dept Endocrinol, Ghent, Belgium
[7] CHU Sart Tilman, Dept Endocrinol, B-4000 Liege, Belgium
[8] Bar Ilan Univ, Fac Life Sci, IL-52100 Ramat Gan, Israel
[9] St Louis Univ, Div Geriatr Med, St Louis, MO 63103 USA
[10] Univ Clin Brussels, Dept Urol, Erasme Hosp, Brussels, Belgium
[11] Harbor UCLA Med Ctr, Gen Clin Res Ctr, Torrance, CA 90509 USA
[12] Univ Giessen, Dept Urol, Giessen, Germany
[13] Cent Manchester Healthcare NHS Trust, Manchester, Lancs, England