RT Journal Article SR Electronic T1 Negative T Waves on the Preoperative Electrocardiogram—A Cause for Worry? JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP S31 OP S31 VO 73 IS 9 esuppl 1 A1 Shenoy, Chetan YR 2006 UL http://www.ccjm.org/content/73/9_esuppl_1/S31.2.abstract AB