RT Journal Article SR Electronic T1 Pregnancy in women with congenital heart defects: what are the risks? JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP 225 OP 226 DO 10.1136/hrt.81.3.225 VO 81 IS 3 A1 SAMUEL SIU A1 DAVID CHITAYAT A1 GARY WEBB YR 1999 UL http://heart.bmj.com/content/81/3/225.abstract AB