1. Division of Pediatric Otolaryngology–Head and Neck Surgery, Ann & Robert H. Lurie Children’s Hospital of Chicago, and Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA
2. Department of Pediatric Anesthesiology, Ann & Robert H. Lurie Children’s Hospital of Chicago, Chicago, Illinois, USA
3. Division of Pediatric Otolaryngology–Head and Neck Surgery, Ann & Robert H. Lurie Children’s Hospital of Chicago, Chicago, Illinois, USA
4. Department of Anesthesiology, Northwestern University, Chicago, Illinois, USA
5. Department of Pediatric Anesthesiology, Ann & Robert H. Lurie Children’s Hospital of Chicago, and Feinberg School of Medicine, Northwestern University, Chicago, Illinois, USA