1 Sociology of Health and Physical Activity, Department of Health Sciences, University of Potsdam, Potsdam, Germany, wippert@uni-potsdam.de.
2 Institute for Biomechanics, Department of Health Sciences and Technology, ETH Zurich, Zurich, Switzerland, wippert@uni-potsdam.de.
3 Sociology of Health and Physical Activity, Department of Health Sciences, University of Potsdam, Potsdam, Germany.
4 Laboratory of Neuroepigenetics, University of Zurich/Swiss Federal Institute of Technology, Brain Research Institute, Neuroscience Center Zurich, Zurich, Switzerland.
5 Psychoneuroimmunology Laboratory, Department of Psychosomatics and Psychotherapy, University of Giessen, Giessen, Germany.
6 Charité Center 12, Internal Medicine and Dermatology, Division for General Internal Medicine, Psychosomatics and Psychotherapy, Universitätsmedizin Berlin, Berlin, Germany.
7 Charité, Division for General Internal Medicine, Psychosomatics and Psychotherapy, Universitätsmedizin Berlin, Berlin, Germany.
8 Social and Preventive Medicine, Department of Health Sciences, University of Potsdam, Potsdam, Germany.
9 University of Potsdam, Outpatient Clinic, Center of Sports Medicine, Potsdam, Germany.
10 Institute for Biomechanics, Department of Health Sciences and Technology, ETH Zurich, Zurich, Switzerland.
11 Schön Clinic Munich Harlaching, Spine Center and Academic Teaching Hospital of the Paracelsus Medical University, Salzburg, Austria.
12 Schön Clinic Munich Harlaching, Spine Center and Academic Teaching Hospital of the Paracelsus Medical University, Munich, Germany.
13 Department of Biomedical Engineering, Rochester Institute of Technology (RIT), Rochester, New York, USA.