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