1. Medical College of Georgia, Pediatric Emergency Medicine Associates, Atlanta, Georgia;
2. Department of Anesthesiology, Baylor College of Medicine, Texas Children's Hospital, Houston, Texas;
3. OLM Digital Inc, Tokyo, Japan;
4. Department of Biostatistics, Rollins School of Public Health, Emory University, Atlanta, Georgia; and
5. Department of Medicine, Baylor College of Medicine, Houston, Texas