title: Quality control site visits to clinics in the Multiple Risk Factor Intervention Trial.
mesh_terms: D002986:Clinical Trials as Topic / Q000592:standards*; D003327:Coronary Disease / Q000517:prevention & control*; D006268:Health Facilities / Q000592:standards*; D006801:Humans; D010380:Peer Review / Q000379:methods*; D011786:Quality Control; D012306:Risk