1. Klinik für Sportorthopädie/Sporttraumatologie, Universitätsklinikum Freiburg, Germany
2. The Center of Integrated Complementary Medicine, Shaare Zedek Medical Center, Jerusalem, Israel
3. d.s.h. statistical services GmbH, Rohrbach, Germany
4. Biologische Heilmittel Heel GmbH, Baden-Baden, Germany