Multiple Choice
A total of 6972 homosexual and bisexual men enrolled in April 1984 have been participating in an ongoing study of HIV/AIDS. Participants are contacted twice a year to answer detailed lifestyle and medical questionnaires and provide a blood sample. This is an example of
A) A retrospective, case-control observational study.
B) A prospective, cohort observational study.
C) A sample survey.
D) A convenience sample.
Correct Answer:
Verified
Correct Answer:
Verified
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