1. Department of Surgery; Universidade Federal de Minas Gerais (UFMG); Belo Horizonte, Minas Gerais Brazil
2. Division of Vascular and Endovascular Surgery, Department of Surgery; UNIFESP - Escola Paulista de Medicina; São Paulo Brazil
3. Department of Surgery; University of Cincinnati; Cincinnati Ohio USA
4. Evidence Based Medicine, Cochrane Brazil; Universidade Federal de São Paulo; São Paulo Brazil