1. Division of Medical Genetics; University of Utah; Salt Lake City UT USA
2. Department of Pediatrics; University of North Carolina; Chapel Hill NC USA
3. Department of Pediatrics; Hôpital Femme Mère Enfant; Lyon France
4. Department of Pediatric Orthopedic Surgery; University of Lyon; Lyon France
5. Sanofi Genzyme; Cambridge MA USA
6. Epidemiology and Biostatistics; Sanofi Genzyme Cambridge MA USA
7. Department of Orthopedics; University of Utah; Salt Lake City UT USA