1 Evandro Chagas National Institute of Infectious Disease (INI) - Oswaldo Cruz Foundation (FIOCRUZ), Laboratory of Clinical Research on STD/AIDS, Rio de Janeiro, Brazil. Electronic address: hugo.perazzo@ini.fiocruz.br.
2 Bonsucesso Federal Hospital, Gastroenterology Department, Rio de Janeiro, Brazil.
3 University of the State of Rio de Janeiro (UERJ), Gastroenterology Department, Rio de Janeiro, Brazil.
4 University of the State of Rio de Janeiro (UERJ), Gastroenterology Department, Rio de Janeiro, Brazil; Federal University of Rio de Janeiro (UFRJ), Internal Medicine Department, Rio de Janeiro, Brazil; D'Or Institute for Research and Education (IDOR), Rio de Janeiro, Brazil.