1. Center for Clinical and Translational Research; Maine Medical Center Research Institute; Scarborough; ME; USA
2. Department of Medicine, Harvard Medical School; Harvard School of Dental Medicine, Harvard University; Boston; MA; USA
3. Department of Orthopaedics and Rehabilitation; Yale University School of Medicine; New Haven; CT; USA
4. Department of Orthopedic Surgery; Beth Israel Deaconess Medical Center and Harvard Medical School; Boston; MA; USA