[1] Univ Fed Pernambuco, Hosp Clin, Dept Cirurgia, NEPAF, BR-50740900 Recife, PE, Brazil
[2] Fiocruz MS, Ctr Pesquisas Aggeu Magalhaes, Recife, PE, Brazil
[3] Univ Fed Pernambuco, Hosp Clin, CCS, Dept Cirugia, BR-50740900 Recife, PE, Brazil
[4] Univ Fed Pernambuco, Dept Pathol, Lab Imunopatol Keiso Asami, BR-50670910 Recife, PE, Brazil
[5] Harvard Univ, Sch Publ Hlth, Dept Immunol & Infect Dis, Boston, MA 02115 USA