1. Department Child and Adolescent Psychiatry and Psychotherapy, University Hospital Ulm, Ulm, Germany
2. Institute of Psychology, German Sport University Cologne, Cologne, Germany
3. The German Research Centre of Elite Sport – momentum, Cologne, Germany
4. Applied Psychology, Thomas More University of Applied Sciences, Antwerp, Belgium
5. Social Epidemiology and Health Policy, University of Antwerp, Antwerp, Belgium
6. University of Wuppertal, Wuppertal, Germany