1 Department of Orthopedic Surgery and Traumatology, Kantonsspital Baselland, Bruderholz, Switzerland.
2 Department of Clinical Research, Research Group Michael T. Hirschmann, Regenerative Medicine & Biomechanics, University of Basel, Basel, Switzerland.
3 Department of Trauma, Hand and Reconstructive Surgery, University of Muenster, Muenster, Germany.
4 Department of Medical and Surgical Specialties, Radiological Sciences, and Public Health, University of Brescia, Brescia, Italy.
5 Department of Bone and Joint Surgery, Spedali Civili, Brescia, Italy.
6 Blue Cross of Western Pennsylvania, University of Pittsburgh, UPMC Freddie Fu Sports Medicine Center, Pittsburgh, Pennsylvania, USA.