1. University Hospital Vrije Universiteit, Department of Rehabilitation Medicine, Amsterdam, Rehabilitation Centre ‘De Trappenberg’, Huizen and Institute for Research in Extramural Medicine, Faculty of Medicine, Vrije Universiteit,
2. The Institute for Research in Extramural Medicine, Faculty of Medicine, Vrije Universiteit, Amsterdam, The Netherlands
3. University Hospital Vrije Universiteit, Department of Rehabilitation Medicine, Amsterdam, The Netherlands
4. University Hospital Vrije Universiteit, Department of Rehabilitation Medicine and Institute for Research in Extramural Medicine, Faculty of Medicine, Vrije Universiteit, Amsterdam, The Netherlands
5. Institute for Research in Extramural Medicine, Faculty of Medicine, Vrije Universiteit, Amsterdam, The Netherlands