1. Department of Pediatrics; Washington University School of Medicine in St. Louis; St. Louis MO
2. Department of Pediatrics; Cincinnati Children's Hospital and University of Cincinnati College of Medicine; Cincinnati OH
3. Department of Pediatrics and Emergency Medicine; Medical College of Wisconsin; Milwaukee WI
4. Division of Biostatistics; Washington University School of Medicine in St. Louis; St. Louis MO
5. Department of Emergency Medicine; University of California-Davis School of Medicine; Sacramento CA
6. Department of Pediatrics; Division of Emergency Medicine; Nationwide Children's Hospital and The Ohio State University College of Medicine; Columbus OH