1 Division of Emergency Medicine, Ann and Robert H. Lurie Children's Hospital of Chicago and Department of Pediatrics, Northwestern University Feinberg School of Medicine, Chicago, Illinois, USA.
2 Sections of Emergency Medicine and Hospital Medicine, Children's Hospital Colorado, Department of Pediatrics, University of Colorado, Aurora, Colorado, USA.
3 Division of Emergency Medicine, Cincinnati Children's Hospital Medical Center and Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, Ohio, USA.
4 Divisions of Hospital Medicine and Infectious Diseases, Cincinnati Children's Hospital Medical Center and Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, Ohio, USA.