1. Department of Orthopaedic Surgery, Division of Sports Medicine, Center for Cartilage Repair, Brigham and Women’s Hospital, Harvard Medical School, Boston, MA, USA
2. Department of Traumatology, Semmelweis University, Budapest, Hungary
3. Department of General Surgery and Medical Surgical Specialties, Section of Orthopaedics and Traumatology, University Hospital Policlinico-Vittorio Emanuele, University of Catania, Catania, Italy
4. University of California–Los Angeles, Los Angeles, CA, USA