RT Journal Article SR Electronic T1 The negative U wave in the setting of demand ischemia (August 2011) JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 785 OP 785 DO 10.3949/ccjm.78c:12003 VO 78 IS 12 A1 Promporn Suksaranjit A1 Wisit Cheungpasitporn A1 Edward F. Bischof A1 Herbert Marx YR 2011 UL http://www.ccjm.org/content/78/12/785.1.abstract AB