1. Department of Surgery, Faculty of Medical Sciences, State University of Campinas, Campinas, Brazil.
2. Colorectal Surgery Unit, Cajuru University Hospital, Catholic University of Paraná, Curitiba, Brazil.
3. Department of Internal Medicine, Faculty of Medical Sciences, State University of Campinas, Campinas, Brazil.
4. Research Laboratory of Metabolism and Diabetes, Gastrocentro, State University of Campinas, Campinas, Brazil.
5. Faculty of Applied Sciences, State University of Campinas, Campinas, Brazil.