RT Journal Article SR Electronic T1 Respiratory artifact: A second vital sign on the electrocardiogram JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 488 OP 490 DO 10.3949/ccjm.82a.14134 VO 82 IS 8 A1 Littmann, Laszlo YR 2015 UL http://www.ccjm.org/content/82/8/488.abstract AB