Marçal Júnior, O.; Hotta, L. K.; Patucci, R. M. de J.; Glasser, C. M.; Dias, L. C. de S. Schistosomiasis Mansoni in an Area of Low Transmission: II. Risk Factors for Infection . Rev. Inst. Med. Trop. São Paulo 1993, 35 (4), 331-335.