Romano S V1, Hubner W2, Trigo Rocha F3, Muller V4, Nakamura F5
1. Urology Departments, Hospital Durand, Buenos Aires, Argentina, 2. Dept. of Urology, Humanis Clinic, Korneuburg, Lower Austria, Austria, 3. Hospital das clinicas, São Paulo , Brasil, 4. Hospital Dos Servidores Do Estado, Rio De Janeiro, Brasil, 5. Centro Medico Ultralitho, Florianopolis, Brazil