[1] UCL, Inst Urol & Nephrol, London W1P 3AA, England
[2] Washington Univ, Sch Med, Div Urol, St Louis, MO USA
[3] St Radboud, Univ Med Ctr, Ctr Minimal Invas Urol, Nijmegen, Netherlands
[4] Univ Vienna, Dept Urol, Vienna, Austria
[5] Hannover Med Sch, Dept Urol, D-3000 Hannover, Germany
[6] Univ Autonoma Madrid, Fdn Jimenez Diaz, Madrid, Spain
[7] Univ Copenhagen, Herlev Hosp, Dept Urol, DK-2730 Herlev, Denmark
[8] Univ Texas, SW Med Ctr, Dept Urol, Dallas, TX USA
[9] Univ Clin Brussels, Erasme Hosp, Brussels, Belgium
[10] St Louis Univ, Ctr Hosp, Paris, France
[11] Univ Aquila, Sch Med, Dept Urol, I-67100 Laquila, Italy
[12] Queens Univ, Dept Urol, Kingston, ON, Canada