1. Gastrointestinal Endoscopy, Department of Gastrointestinal Endoscopy, Hospital 9 de Julho, São Paulo, Brazil
2. Department of Radiology, Irmandade da Santa Casa de Misericórdia de São Paulo, São Paulo, Brazil
3. Hospital do Servidor Público Municipal, São Paulo, Brazil
4. Gastrointestinal Endoscopy Service, Department of Gastrointestinal Endoscopy, Hospital das Clinicas, University of São Paulo Riberão Preto, São Paulo, Brazil