1. Department of Orthopaedic Surgery, The Johns Hopkins University, Baltimore, Maryland, USA.
2. Department of Orthopaedics and Rehabilitation, Yale School of Medicine, Yale University, New Haven, Connecticut, USA.
3. Division of Orthopaedics, Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania, USA.
4. Investigation performed at the Division of Orthopaedics, Children’s Hospital of Philadelphia, Philadelphia, Pennsylvania, USA