1. Medical Oncology, Instituto do Câncer do Estado de São Paulo, Hospital das Clínicas, University of São Paulo, School of Medicine, São Paulo, Brazil
2. Department of Radiation Oncology, Instituto do Câncer do Estado de São Paulo, Hospital das Clínicas, University of São Paulo, School of Medicine, São Paulo, Brazil
3. Department of Radiology, Hospital das Clínicas, University of São Paulo, School of Medicine, São Paulo, Brazil
4. Department of Gastroenterology, Division of Clinical Gastroenterology and Hepatology, Hospital das Clínicas, University of São Paulo School of Medicine, São Paulo, Brazil
5. Instituto do Câncer do Estado de São Paulo, Hospital das Clínicas, University of São Paulo School of Medicine, São Paulo, Brazil