RT Journal Article SR Electronic T1 Pitfalls in interpretation of the pulmonary valve echogram in patients with congenital heart disease JF Cleveland Clinic Journal of Medicine JO Cleve Clin J Med FD Cleveland Clinic SP 261 OP 273 VO 47 IS 4 A1 Moodie, Douglas S. YR 1980 UL http://www.ccjm.org/content/47/4/261.abstract AB