1Division of Orthopaedic Surgery, Children's Hospital of Philadelphia, 2nd Floor Wood Building, 34th Street and Civic Center Boulevard, Philadelphia, PA 19104. E-mail address: firstname.lastname@example.org. 2The University of California at Berkeley School of Public Health, 506 Warren Hall, Berkeley, CA 94720-7360. 3Department of Orthopaedic Surgery, University of California at San Francisco, 1001 Potrero Avenue, #3A36, San Francisco, CA 94110. 4Academy of Traumatology, A/35, Someshvara II, Satellite Road, Ahmedabad 380015 India. 5Department of Orthopaedic Surgery, University of Connecticut Health Center, 10 Talcott Notch Road Farmington, CT 06034-4037.Investigation performed at Children's Hospital of Philadelphia, the University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania; the University of California at Berkeley School of Public Health, Berkeley, California; San Francisco General Hospital, the University of California at San Francisco School of Medicine, San Francisco, California; Academy of Traumatology, Ahmedabad, Gujarat, India; and the University of Connecticut Health Center, University of Connecticut School of Medicine, Farmington, Connecticut.