1. Department of Orthopaedics, Box 306, Tufts Medical Center, 800 Washington Street, Boston, MA 02111, USA,
2. New England Baptist Hospital, Boston, MA, USA
3. Boston University School of Medicine, Boston, MA, USA
4. Pfizer, Global Research and Development, New London, CT, USA
5. Boston University School of Medicine, Boston, MA, USA,/Lund University, Lund, Sweden
6. Kansas University Medical Center, Fairway, KS, USA