1. Department of Orthopedics and Trauma Surgery, Academic Physiotherapy, Pain and Exercise Research, University of Lübeck, Medical Section, Lübeck, Germany; and Department of Systems Neuroscience, University Medical-Centre Hamburg-Eppendorf, Hamburg, Germany
2. Centre for Therapy and Training, Schoen Klinik München, München, Germany
3. Back Pain Clinic St. Georg, Hamburg, Germany
4. Department of Applied Health Sciences, University of Applied Sciences, Bochum, Germany
5. Activatio—Zentrum für Physiotherapie und Training, Hamburg, Germany; and Department of Systems Neuroscience, University Medical-Centre Hamburg-Eppendorf
6. Activatio—Zentrum für Physiotherapie und Training
7. Department of Orthopedics and Trauma Surgery, Academic Physiotherapy, Pain and Exercise Research, University of Lübeck, Medical Section, Ratzeburger Allee 160, 23562 Lübeck, Germany; and Department of Systems Neuroscience, University Medical-Centre Hamburg-Eppendorf