1. Centre for Physical Development Research,
2. Department of Kinesiology, Faculty of Physical Education and Physiotherapy, Katholieke Universiteit Leuven, Leuven, Belgium,
3. Virginia Institute for Psychiatric and Behavioral Genetics, Department of Human Genetics, Virginia Commonwealth University, Virginia, USA,
4. Department of Kinesiology, McMaster University, Hamilton, Ontario, Canada
5. Radiology Unit, Faculty of Medicine, Katholieke Universiteit Leuven, Leuven, Belgium,
6. Centre for Human Genetics,