title: Sample size for randomized trials in stroke prevention. How many patients do we need?
mesh_terms: D002561:Cerebrovascular Disorders / Q000517:prevention & control*; D002986:Clinical Trials as Topic / Q000379:methods*; D006801:Humans; D002546:Ischemic Attack, Transient / Q000150:complications; D011897:Random Allocation; D012306:Risk; D012494:Sampling Studies; D013223:Statistics as Topic; D013997:Time Factors