1. Santa Casa of São Paulo Medical School, São Paulo, Brazil
2. Endoscopy Department, Hospital 9 de Julho, São Paulo, Brazil
3. Digestive Endoscopy Section, Department of Surgery and Anatomy, Clinical Hospital of Ribeirão Preto Medical School, University of São Paulo (HCFMRP-USP), São Paulo, Brazil
4. Department of Diagnostic Imaging, Escola Paulista de Medicina, Universidade de São Paulo, São Paulo, Brazil