1. Loyola University Medical Center, Maywood, IL, USA
2. General Surgery, Hospital de Ensino da Faculdade de Medicina do ABC, SP, Brazil
3. Vascular Surgery, Hospital de Base de Brasilia, DF, Brazil
4. General Surgery, Irmandade da Santa Casa de Misericórdia de São Paulo, SP, Brazil
5. Vascular Surgery, Escola paulista de Medicina, Sao Paulo, SP, Brazil
6. Aurora Memorial Hospital, Burlington, WI, USA