<qa>  What is the purpose of this study?The purpose of this study is to determine completeness of revascularization, graft patency, clinical outcomes, health-related quality of life and costs in 200 initial trial participants at 5 years post surgery who had heart bypass surgery with heart-lung bypass on-pump or without heart-lung bypass off-pump. The hypothesis is that the patency of coronary artery bypass grafts of off-pump surgery are no less durable than grafts from conventional on-pump surgery. 