Epidemiology of poliomyelitis in Delhi, 1997.
John
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D006801:Humans; D017589:Immunization Programs / Q000458:organization & administration*; D007194:India / Q000453:epidemiology; D011051:Poliomyelitis / Q000453:epidemiology / Q000517:prevention & control*; D011159:Population Surveillance / Q000379:methods*