1. Department of Radiology, Hershey Children's Hospital, Penn State Health Milton S. Hershey Medical Center, Penn State College of Medicine, 500 University Dr, Hershey, PA 17033.
2. Department of Pediatrics, Division of Biostatistics, Children's Hospital of Philadelphia, Philadelphia, PA.
3. Department of Epidemiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA.
4. Department of Pediatrics, Division of Rheumatology, Children's Hospital of Philadelphia, Philadelphia, PA.
5. Department of Radiology, Children's Hospital of Philadelphia, Philadelphia, PA.
6. Department of Pediatrics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA.