RT Journal Article SR Electronic T1 The Risk of Anesthesia and Surgical Operation in Patients with Heart Disease JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 189 OP 194 VO 13 IS 4 A1 Ernstene, A. Carlton YR 1946 UL http://www.ccjm.org/content/13/4/189.abstract AB