1. Department of Obstetrics and Gynecology , Technical University of Munich, School of Medicine, University Hospital rechts der Isar , Munich , Germany
2. Statistics and Epidemiology , Technical University of Munich, School of Medicine, University Hospital rechts der Isar, Institute of Medical Informatics , Munich , Germany
3. Faculty of Sport and Health Science , Institute of Preventive Pediatrics , Munich , Germany
4. Department of Pediatric Cardiology and Congenital Heart Defects , German Heart Centre Munich , Munich , Germany