1. Growth and Development Laboratory, Department of Orthopaedic Surgery, Children's Hospital of Pittsburgh and University of Pittsburgh, Pittsburgh, PA 15260; Department of Orthopaedic Surgery, University of Pittsburgh Medical Center, Pittsburgh, PA 15260; Department of Molecular Genetics and Biochemistry, University of Pittsburgh, Pittsburgh, PA 15260
2. Growth and Development Laboratory, Department of Orthopaedic Surgery, Children's Hospital of Pittsburgh and University of Pittsburgh, Pittsburgh, PA 15260; Department of Orthopaedic Surgery, University of Pittsburgh Medical Center, Pittsburgh, PA 15260
3. Growth and Development Laboratory, Department of Orthopaedic Surgery, Children's Hospital of Pittsburgh and University of Pittsburgh, Pittsburgh, PA 15260
4. Department of Orthopaedic Surgery, University of Pittsburgh Medical Center, Pittsburgh, PA 15260
5. Department of Molecular Genetics and Biochemistry, University of Pittsburgh, Pittsburgh, PA 15260
6. Growth and Development Laboratory, Department of Orthopaedic Surgery, Children's Hospital of Pittsburgh and University of Pittsburgh, Pittsburgh, PA 15260; Department of Molecular Genetics and Biochemistry, University of Pittsburgh, Pittsburgh, PA 15260