RT Journal Article SR Electronic T1 Presumed premature ventricular contractions JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 812 OP 814 DO 10.3949/ccjm.78a.10155 VO 78 IS 12 A1 Moises Auron A1 Donald Underwood YR 2011 UL http://www.ccjm.org/content/78/12/812.abstract AB