OrthoCentrum Hamburg, Hamburg, Germany
Robert-Koch-Krankenhaus Apolda, Apolda, Germany
St. Elisabeth-Krankenhaus, Salzgitter, Germany
Horizon Clinical Research, La Mesa, California, United States
Physicians Research Group, Tempe, Arizona, United States
Hackensack University Medical Center, Hackensack, New Jersey, United States
Sports Medicine Umeå, Umeå, Sweden
Aleris Specialistvård, Stockholm, Sweden
Lund University Hospital, Department of Ortopedics, Lund, Sweden