1. Department of Orthopaedic Surgery, Children's Hospital Central California, Madera, California
2. Department of Orthopedics, Nemours/Alfred I. duPont Hospital for Children, Wilmington, Delaware
3. Growing Spine Study Group, La Jolla, California
4. San Diego Center for Spinal Disorders, La Jolla, California
5. Deptartment of Orthopaedic Surgery, Hacettepe University, Sihhiye, Ankara, Turkey