A discussion document
نویسندگان
چکیده
1 Infectious Disease Epidemiology Unit, Department of Infectious and Tropical Diseases, London School of Hygiene and Tropical Medicine, Keppel Street, London WC1E 7HT, England. 2 Scientist, Department of Vaccines and Biologicals, Health Technology and Pharmaceuticals, World Health Organization, 1211 Geneva 27, Switzerland. 3 Medical Officer, Department of Vaccines and Biologicals, Health Technology and Pharmaceuticals,World Health Organization, 1211 Geneva 27, Switzerland.
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تاریخ انتشار 1999