1. Department of Pediatrics, University of South Carolina School of Medicine, Greenville Hospital System University Medical Center, Greenville, South Carolina;
2. Division of General Pediatrics, Department of Pediatrics, University of South Carolina School of Medicine, Columbia, South Carolina;
3. Department of Pediatrics, University of Rochester School of Medicine, Rochester General Hospital, Rochester, New York; and
4. Department of Pediatrics, University of Colorado School of Medicine, The Children's Hospital, Medical Education, Aurora, Colorado