1. Institute of Sports Science, University of Tübingen, Tübingen, Germany
2. Interfaculty Research Institute for Sports and Physical Activity, University of Tübingen, Tübingen, Germany
3. Department of Sports Medicine, University Hospital of Tübingen, Tübingen, Germany
4. Center for Geriatric Medicine, University Hospital of Tübingen, Tübingen, Germany
5. Institute of Social and Preventive Medicine, University of Bern, Bern, Switzerland