RT Journal Article SR Electronic T1 A Simplified Approach to Electrocardiography by Richard Johnson and Mark H. Swartz JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 351 OP 351 VO 54 IS 4 A2 Zakov, Z. Nicholas A1 Underwood, Donald A. YR 1987 UL http://www.ccjm.org/content/54/4/351.1.abstract AB