Doll and Hill study on smoking and lung cancer is a:
A. Case Control study
B. Prospective Cohort study
C. Retrospective Cohort study
D. A combination of Retrospective Cohort study and Prospective Cohort study
Answer:B
Doll and Hill study on smoking and lung cancer is a:
A. Case Control study B. Prospective Cohort study C. Retrospective Cohort study D. A combination of Retrospective Cohort study and Prospective Cohort study