1. Colorectal Surgery Unit; Cajuru University Hospital; Catholic University of Paraná (PUCPR); Curitiba Brazil
2. Colorectal Surgery Unit; Campinas State University (UNICAMP); Campinas Brazil
3. Biostatistics Department; Catholic University of Paraná (PUCPR); Curitiba Brazil
4. IBD Centre; Yokkaichi Hazu Medical Centre; Yokkaichi Japan