[1] EMCO Private Clin, A-5422 Bad Durrnberg, Austria
[2] Lund Univ, Reprod Med Ctr, Skane Univ Hosp, Malmo, Sweden
[3] Free Univ Brussels, Ctr Reprod Med, B-1050 Brussels, Belgium
[4] Univ Giessen, Univ Hosp Giessen, Dept Urol Paediat Urol & Androl, Giessen, Germany
[5] Univ Giessen, Marburg GmbH, Giessen, Germany
[6] Semmelweis Univ, Dept Urol, Androl Ctr, H-1085 Budapest, Hungary
[7] Erasmus Univ, Med Ctr, Rotterdam, Netherlands
[8] Univ Florence, Dept Clin Physiopathol, Florence, Italy