Quality control procedures for the resting electrocardiogram in the Multiple Risk Factor Intervention Trial.
D002986:Clinical Trials as Topic / Q000592:standards*; D003327:Coronary Disease / Q000517:prevention & control*; D004562:Electrocardiography / Q000295:instrumentation / Q000379:methods / Q000592:standards*; D006801:Humans; D011786:Quality Control; D012306:Risk