1. Advocare Cherry Hill Pediatric Group, Cherry Hill, New Jersey, USA
2. Perelman School of Medicine at the University of Pennsylvania, Department of Pediatrics, Philadelphia, Pennsylvania
3. Cooper Medical School of Rowan University, Camden, USA
4. Cooper Bone and Joint Institute, Division of Sports Medicine, Cooper University Hospital, Camden, USA
5. Department of Pediatric Neurology, Division of Pediatric Rehabilitation, Cooper University Hospital, Camden, USA
6. Center for Clinical Epidemiology and Biostatistics, Perelman School of Medicine at the University of Pennsylvania, Philadelphia, USA