RT Journal Article SR Electronic T1 Pulmonary hypertension after timely arterial switch operation in children with simple transposition of the great arteries: a new disease entity? JF Heart JO Heart FD BMJ Publishing Group Ltd and British Cardiovascular Society SP heartjnl-2016-311105 DO 10.1136/heartjnl-2016-311105 A1 Astrid E Lammers A1 Ulrike M M Bauer YR 2017 UL http://heart.bmj.com/content/early/2017/03/16/heartjnl-2016-311105.abstract AB