RT Journal Article SR Electronic T1 Extracardiac cause of right ventricular outflow tract obstruction JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 364 OP 364 DO 10.1136/hrt.2004.038885 VO 91 IS 3 A1 D Foo A1 K Ng YR 2005 UL http://heart.bmj.com/content/91/3/364.abstract AB