The studies reported here were supported in part by the Chiang Mai-Illinois Project and by a grant (G-50) from the Midwest Universities Consortium for International Activities, Inc. Dr. Doege is associate professor, Department of Preventive Medicine and Community Health, University of Illinois at the Medical Center, Chicago; he was formerly visiting associate professor, Faculty of Medicine, Chiang Mai University, and member, Chiang Mai-Illinois Project. Dr. Na Bangxang is head, Department of Preventive and Social Medicine, Faculty of Medicine, Chiang Mai University, Chiang Mai, Thailand.
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R M Scheffler (1971) studied this question.