1. Department of General Surgery, São Francisco University Hospital, Bragança Paulista, SP, Brazil
2. São Francisco University Medical School, SP, Brazil
3. Division of General Surgery, São Francisco University Medical School, SP, Brazil
4. Postgraduate Program in Health Sciences, University of São Francisco, Rua José Raposo de Medeiros, 474, apto.602, 12914-450 Bragança Paulista, SP, Brazil