1. Division of Gastroenterology and Hepatology, Toronto Centre for Liver Disease, Toronto General Hospital University Health Network Toronto Ontario Canada
2. Instituto Alfa de Gastroenterologia Hospital das Clínicas da Universidade Federal de Minas Gerais Belo Horizonte Brazil
3. Division of Gastroenterology and Hepatology Hospital da Polícia Militar de Minas Gerais Belo Horizonte Brazil