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The Children's Service, Massachusetts General Hospital Harvard Medical School, Boston, MA. Address for reprints: MacArthur Center for Molecular Parasitology and Division of Pediatric Infectious Diseases, Department of Pediatrics, Yale University, School of Medicine, P. O. Box 3333, 700 LEPH, 60 College Street, New Haven, CT 06510.
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Peter Jay Hotez (1989) studied this question.
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