Department of Rehabilitation Sciences, Ghent University, 9000 Ghent, Belgium. Research Foundation Flanders, 1000 Brussels, Belgium. Department of Public Health and Primary Care, Ghent University, 9000 Ghent, Belgium. Department of Nutrition and Dietetics, School of Physical Education, University of Thessaly, Sport Science and Dietetics, 421 00 Trikala, Greece. Department of Physiatry and Nursing, GENUD (Growth, Exercise, Drinking Behaviour and Development), University of Zaragoza, 50001 Zaragoza, Spain. Department of Pediatrics, Medical University Varna, 9002 Varna, Bulgaria. Dr. von Hauner Children's Hospital, University of Munich Medical Centre, 80337 Munich, Germany. Children's Memorial Institute, 04-730 Warsaw, Poland. Department of Nutrition and Dietetics, School of Health Sciences & Education, Harokopio University, 17778 Athens, Greece. Department of Movement and Sports Sciences, Ghent University, 9000 Ghent, Belgium.