[1] Universidade Federal de Pernambuco (UFPE),Postgraduate Program in Tropical Medicine, Center of Medical Sciences
[2] Hospital das Clínicas – Universidade Federal de Pernambuco (UFPE),Gastroenterology Division
[3] Universidade Federal de Pernambuco (UFPE),Laboratory of Virology, Keizo Asami Institute (LIKA), Departament of Phisiology and Pharmacology
[4] Hemocentro de Alagoas (Hemoal),Laboratory of Immunohematology
[5] Universidade de São Paulo,Laboratory of Gastroenterology and Tropical Hepatology, Institute of Tropical Medicine and Department of Gastroenterology, Faculty of Medicine
[6] Universidade Federal de Pernambuco (UFPE),Department of Internal Medicine, Center of Medical Sciences