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1دورية أكاديمية
المؤلفون: Fishman JA, Allison H, Knowles SB, Fishburn BA, Woollery TA, Marx WT, Shelton DM, Husten CG, Eriksen MP, US Department of Health and Human Services. Centers for Disease Control and Prevention
المصدر: MMWR: Morbidity & Mortality Weekly Report; 06/25/1999 Supplement SS-3, Vol. 48 Issue 24, p21-40, 20p