1. Department of Urology, Tenon Hospital, Université Paris VI, Pierre et Marie Curie, Paris, France
2. Group Recherche Clinique Lithiase, Université Paris VI, Pierre et Marie Curie, Paris, France
3. Fundación Puigvert, Department of Urology, Universidad Autonoma de Barcelona, Barcelona, Spain
4. Boramae Medical Center, Department of Urology, Seoul Metropolitan Government-Seoul National University, Seoul, Republic of Korea