1 Angelita & Joaquim Gama Institute, São Paulo, Brazil; University of São Paulo School of Medicine, São Paulo, Brazil. Electronic address: gamange@uol.com.br.
2 Angelita & Joaquim Gama Institute, São Paulo, Brazil; Colorectal Surgery Division, University of São Paulo School of Medicine, São Paulo, Brazil; Ludwig Institute for Cancer Research, São Paulo, Brazil; Gastrointestinal Surgical Oncology Division, Beneficência Portuguesa de São Paulo, São Paulo, Brazil.