[Verified Answer]: s 12 and 13 are based on the following…

Questions 12 and 13 are based on the following published article. Investigators enrolled 11541 men with coronary heart disease in a study. Baseline data collection included information on current medications. Of the 11541 men, 254 men were taking metformin, a medication for persons with Type 2 diabetes mellitus. Of these 254 men, 5 developed prostate cancer during the follow-up period. In the men who were not taking metformin, 454 developed prostate cancer. Question 12. What type of study is this? Case report Case series Cross-sectional study Ambidirectional cohort study Ecological study Prospective cohort study Retrospective cohort study Case-control study Nested case-control study Community trial Clinical trial with randomized controls Clinical trial with crossover controls