1. Integrative and Experimental Training Science, Department of Sport Science; Julius Maximilians University Würzburg; Judenbühlweg 11, 97082 Würzburg Germany
2. Department of Radiology; University Hospital of Cologne; Cologne Germany
3. Philips Healthcare Germany; Hamburg Germany
4. Department III of Internal Medicine; University of Cologne; Cologne Germany
5. Swedish Winter Sports Research Centre, Department of Health Sciences; Mid Sweden University; Östersund Sweden
6. School of Kinesiology; University of British Columbia; Vancouver British Columbia Canada