1. UNIFESP - Escola Paulista de Medicina; Department of Surgery; Rua Borges Lagoa, cj 564, CJ 124 Vila Clementino São Paulo São Paulo Brazil 04038000
2. Universidade Federal de São Paulo; Evidence Based Medicine, Cochrane Brazil; Rua Borges Lagoa, 564, cj 124 São Paulo São Paulo Brazil 04038-000
3. UNIFESP - Escola Paulista de Medicina; Division of Vascular and Endovascular Surgery, Department of Surgery; Rua Borges Lagoa, 564 cj 124 Vila Clementino São Paulo Brazil 04038000