1. Gastrointestinal Endoscopy Unit Instituto D´Or de Pesquisa e Ensino, Hospital Vila Nova Star São Paulo Brazil
2. Gastrointestinal Endoscopy Unit Instituto D´Or de Pesquisa e Ensino, Hospital São Luiz Morumbi São Paulo Brazil
3. Gastrointestinal Endoscopy Unit, Department of Gastroenterology Hospital das Clínicas da Faculdade de Medicina da Universidade de São Paulo São Paulo Brazil
4. Lynda K. and David M. Underwood Center for Digestive Disorders Houston Methodist Hospital Houston USA
5. Gastrointestinal Endoscopy Unit Instituto D´Or de Pesquisa e Ensino, Hospital São Luiz Jabaquara São Paulo Brazil
6. Gastrointestinal Endoscopy Unit Instituto D´Or de Pesquisa e Ensino, Hospital Santa Luzia Brasilia Brazil
7. Gastrointestinal Endoscopy Unit Hospital Nossa Senhora das Graças Curitiba Brazil
8. Department of Surgery Hospital Universitário Onofre Lopes Natal Brazil