Humans / Female / Feasibility Studies / Male / Follow-up studies / Middle Aged / Coronary Angiography / Coronary heart disease / Public health systems and services research / SAPHENOUS VEIN / Coronary artery bypass surgery / The American / Middle Aged / Coronary Angiography / Coronary heart disease / Public health systems and services research / SAPHENOUS VEIN / Coronary artery bypass surgery / The American