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Who investigated the relationship between smoking and lung cancer using a cohort study design?
United States
A country located in North America, consisting of 50 states and a federal district, known for its diverse geography and economy.
Portugal
A country located in Southern Europe on the Iberian Peninsula, known for its long history, cultural heritage, and maritime explorations.
Exchange Rate
The value of one country's currency expressed in terms of another country's currency.
United States
A country located in North America, consisting of 50 states and known for its large economy and diverse population.
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