1. Colorectal Surgery Unit, IBD Outpatients Clinic, Cajuru University Hospital, Catholic University of Parana (PUCPR), Curitiba, Brazil.
2. Colorectal Surgery Unit, Department of Surgery, Campinas State University (UNICAMP), Campinas, Brazil.
3. Department of Biostatistics, Catholic University of Parana (PUCPR), Curitiba, Brazil.