1. Coloproctology Service, Hospital Santa Marcelina, Faculdade Santa Marcelina, São Paulo, SP, Brazil
2. Coloproctology service, Santa Marcelina College, São Paulo, SP, Brazil
3. Coloproctology Service, Hospital Santa Marcelina, São Paulo, SP, Brazil
4. Coloproctology Service, Gastroenterology Department, Faculty of Medicine, Hospital das Clínicas, Universidade de São Paulo, São Paulo, SP, Brazil
5. General Surgery Department, Hospital Santa Marcelina, São Paulo, SP, Brazil