Q:

According to a study conducted by WHO the incidence of polio in Sindh province having a total population of 20 million was 1 during the year 2007, which type of study was this:

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According to a study conducted by WHO the incidence of polio in Sindh province having a total population of 20 million was 1 during the year 2007, which type of study was this:


  1. Case report
  2. Cross sectional
  3. Case control
  4. Cohort
  5. Ecological

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d) Cohort

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