RT Journal Article SR Electronic T1 Premature ventricular contractions: risk of sudden death JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 567 OP 567 VO 59 IS 6 A2 Longworth, David L. A1 Stoller, James K. A1 Castle, Lon W. YR 1992 UL http://www.ccjm.org/content/59/6/567.1.abstract AB