1. Hector-Center for Nutrition, Exercise and Sports, Department of Medicine 1, University Hospital Erlangen, Friedrich-Alexander University Erlangen-Nürnberg, 91054 Erlangen, Germany
2. Department of Medicine 1, University Hospital Erlangen, Friedrich-Alexander University Erlangen-Nürnberg, 91054 Erlangen, Germany
3. IDC Research Institute, SRH University Wilhelm Löhe, 90763 Fürth, Germany
4. Faculty of Social Work, Catholic University Eichstätt-Ingolstadt, 85071 Eichstätt, Germany