1. Department of Pediatrics, University of Utah School of Medicine, Salt Lake City, Utah;
2. Utah Valley Regional Medical Center, Provo, Utah;
3. Department of Pediatrics, Hebei Provincial Children’s Hospital, Shijiazhuang, China;
4. Department of Pediatrics, Wilford Hall Medical Center, Lackland Air Force Base, Texas; and
5. Department of Pediatrics, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania