1. Orthopaedic Research Laboratories, Boston Children's Hospital, Boston, MA, USA
2. Department of Genetics, Harvard Medical School, Boston, MA, USA
3. Departments of Orthopaedics and Medicine, Brigham and Women's Hospital, Boston, MA, USA
4. Harvard Medical School, Boston, MA, USA
5. Department of Radiology, Brigham and Women's Hospital, Boston, MA, USA