1. Division of Medicine Federal University of the Southern Border (Universidade Federal da Fronteira Sul) Passo Fundo Brazil
2. Affonso Guizzo Regional Hospital (Hospital Regional Affonso Guizzo) Araranguá Brazil
3. Division of Medicine Federal University of Health Sciences of Porto Alegre (Universidade Federal de Ciências da Saúde de Porto Alegre) Porto Alegre Brazil
4. Division of Surgery Center for Abdominal Core Health Cleveland Clinic Foundation Cleveland Ohio USA