1. Division of Emergency Medicine, Department of Pediatrics, University of Pittsburgh, UPMC Children's Hospital of Pittsburgh, Pittsburgh, PA
2. Department of Pediatrics, University of Cincinnati College of Medicine; Division of Emergency Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, OH
3. Division of Adolescent and Young Adult Medicine, University of Pittsburgh, UPMC Children's Hospital of Pittsburgh, Pittsburgh, PA
4. University of Cincinnati, Cincinnati, OH