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Authors' addresses: Daniel H. Paris and Nicholas P. Day, Mahidol Oxford Tropical Medicine Research Unit, Faculty of Tropical Medicine, Mahidol University, Bangkok, Thailand, E-mails: firstname.lastname@example.org and email@example.com. Thomas R. Shelite and David H. Walker, Department of Pathology, University of Texas Medical Branch, Galveston, TX, E-mails: firstname.lastname@example.org and email@example.com.