title: Frequency of minor nonspecific ECG changes in populations with different prevalence of coronary heart disease (including a study of familial clustering).
mesh_terms: D000328:Adult; D003327:Coronary Disease / Q000453:epidemiology / Q000235:genetics / Q000503:physiopathology*; D004562:Electrocardiography; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D012383:Romania; D012737:Sex Factors