Comparison of the Effects of Carbon Dioxide and Helium Pneumoperitoneum on Renal Function - Carmona, Murilo; Lopes, Roberto Iglesias; Borba, Marcelo; Omokawa, Maurício; Naufal, Rafael; Miyaji, Karina Takesaki; Matsumura, Norio; Vieira, Newton; Pereira, Paulo Roberto Bueno (Journal of Endourology, 2008)