1. M. A. Kuijper, MD, is Pediatric Rehabilitation Physician, Rehabilitation Center De Hoogstraat, Rembrandtkade 10, 3583TM Utrecht, The Netherlands, and Department of Rehabilitation, Nursing Science and Sports, University Medical Centre, Utrecht, The Netherlands; MAKuyper@dehoogstraat.nl
2. G. J. van der Wilden, MD, is Pediatric Rehabilitation Physician, Rehabilitation Centre het Roessingh, Enschede, The Netherlands
3. M. Ketelaar, PhD, MD, is Associate Professor, Rehabilitation Center De Hoogstraat, Utrecht, The Netherlands; Department of Rehabilitation, Nursing Science and Sports, Rudolf Magnus Institute of Neuroscience, University Medical Centre, Utrecht, The Netherlands; and Partner of NetChild, Network for Childhood Disability Research in The Netherlands
4. J. W. Gorter, PhD, is Associate Professor, CanChild Centre for Childhood Disability Research, McMaster University, Hamilton, Ontario, Canada, and Partner of NetChild