title: Letter: First and second versus second and third exercise tests.
mesh_terms: D001026:Coronary Artery Bypass; D003326:Coronary Circulation; D003327:Coronary Disease / Q000503:physiopathology*; D005080:Exercise Test / Q000592:standards*; D006321:Heart / Q000503:physiopathology; D006801:Humans; D009204:Myocardial Revascularization