1. Cartilage Biology and Orthopaedics Branch, National Institute of Arthritis, and Musculoskeletal and Skin Diseases, National Institutes of Health, Department of Health and Human Services, Bethesda, Maryland.
2. Present address: Inserm U 844, Hôpital Saint-Eloi, Bâtiment INM, Montpellier, France.
3. Present address: Orthopaedic Center for Muskuloskeletal Research König Ludwig Haus, Julius-Maximilians University, Würzburg, Germany.
4. Present address: Department of Otorhinolaryngology, Head & Neck Surgery, Zagreb Clinical Hospital Center, Zagreb University School of Medicine, Zagreb, Croatia.