Figueiredo J F, Martinez R, da Costa J C, Moysés Neto M, Suaid H J, Ferraz A S
Department of International Medicine, Faculty of Medicine of Ribeirão Preto, University of São Paulo, Brazil.
Trans R Soc Trop Med Hyg. 1990 Jan-Feb;84(1):61-2. doi: 10.1016/0035-9203(90)90383-p.