Center of Excellence for Rehabilitation Medicine and UMC Utrecht Brain Center, University Medical Center Utrecht and De Hoogstraat Rehabilitation, Utrecht University, Utrecht, The Netherlands.
Center for Rehabilitation, University Medical Center Groningen and University of Groningen, Groningen, The Netherlands.
European spine journal : official publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society