RT Journal Article SR Electronic T1 Factors influencing patency of coronary bypass grafts JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 109 OP 111 VO 45 IS 1 A1 Sheldon, William C. YR 1978 UL http://www.ccjm.org/content/45/1/109.abstract AB