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Several investigators are investigating the hypothesis that variation in provincial governmental immunization requirements among 23 Chinese provinces affects measles vaccination prevalence among 4 year olds

Several investigators are investigating the hypothesis that variation in provincial governmental immunization requirements among 23 Chinese provinces affects measles vaccination prevalence among 4 year olds in 2019. What study design would they use?

Select one or more:

a. Case control

b. Ecologic cross-sectional

c. Retrospective cohort

d. Case series

e. Prospective cohort

f. Pre/post interventio

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