Kumpf Matthias, Sieverding Ludger, Gass Matthias, Kaulitz Renate, Ziemer Gerhard, Hofbeck Michael
Department of Pediatric Cardiology, Pulmonology and Intensive Care, Universitätsklinikum Tübingen, Tübingen, Germany.
BMJ. 2006 May 13;332(7550):1139-41. doi: 10.1136/bmj.332.7550.1139.