The changing age structure of diphtheria patients: evidence for the effectiveness of EPI in the Sudan.

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Loevinsohn, B. P. (1990). The changing age structure of diphtheria patients: evidence for the effectiveness of EPI in the Sudan.. Bulletin of the World Health Organization, 68 (3), 353 - 357. World Health Organization. https://apps.who.int/iris/handle/10665/261282