1. Fédération Internationale de Football Association Medical Assessment and Research Center (F-MARC), Zurich, Switzerland
2. Schulthess Clinic, Zurich, Switzerland
3. Department of Sport and Sport-pedagogic, Pedagogic-University, Freiburg, Germany
4. Gothenburg Medical Center, Vastra Frölunda, Sweden
5. Office for Management in Medical Research, Teningen, Germany