1. Department of Anesthesiology; Children's Hospital Colorado; University of Colorado School of Medicine; Aurora CO USA
2. Department of Anesthesiology; Lucile Packard Children's Hospital; Stanford University; Palo Alto CA USA
3. Department of Emergency Medicine; Children's Hospital Colorado; University of Colorado School of Medicine; Aurora CO USA
4. Department of Anesthesiology; Ochsner Hospital for Children; New Orleans LA USA
5. Department of Otolaryngology; Children's Hospital Colorado; University of Colorado School of Medicine; Aurora CO USA