1. Otto Loewi Research Center, Division of Physiology, Medical University of Graz, Graz, Austria
2. Institute of Human Movement Science, Sport & Health; Exercise Physiology, Training & Training Therapy Research Group, University of Graz, Graz, Austria
3. Center for Health and Bioresources, Medical Signal Analysis, AIT Austrian Institute of Technology, Vienna, Austria
4. Center for Public Health, Department of Epidemiology, Medical University of Vienna, Vienna, Austria