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A study is conducted to ascertain the risk factors contributing to asthma in Bronx youth ages 9-12. 422 Bronx residents, ages 9-12, have agreed to participate in the study. Given the study's objective, what is the best approach to use?

a. Case-control

b. Cohort

c. Clinical trial

d. Meta-analysis

e. Randomized, double-blind trial
in Family Medicine/Stats by

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a. Case-control