4.4 Subject Screening Patients that have been already scheduled for isolated CABG operation will be addressed by a member of the research team during the preoperative waiting period (either in the Department of Cardiothoracic Surgery, the Department of Cardiology or the Department of Internal Medicine). The goal of the study, procedure and incentive will be explained by a research staff member to each potential participant. Consenting subjects will be asked to provide written consent.