which of the following studies apply to this: Occurrence of cancer was identified between April 1991 and July 2002 for 50,000 troops who served in the first Gulf War (ended April 1991) and 50,000 troops who served elsewhere during the same period?
A) Observational cohort.
B) Experimental.
C) Observational case-control.
D) Observational case-control
Correct Answer:
Verified
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A)
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