1. Department of Pediatrics Harvard Medical School Boston Massachusetts USA
2. Departments of Pediatrics and Emergency Medicine Yale School of Medicine New Haven Connecticut USA
3. Departments of Pediatrics and Emergency Medicine University of California San Francisco San Francisco California USA
4. Department of Anesthesiology and Critical Care Perelman School of Medicine at the University of Pennsylvania Philadelphia Pennsylvania USA
5. Department of Pediatrics University of Cincinnati College of Medicine Cincinnati Ohio USA
6. University of Colorado Aurora Colorado USA