1. Thomas Jefferson University Department of Otolaryngology—Head & Neck Surgery Philadelphia Pennsylvania USA
2. Division of Pediatric Otolaryngology—Head & Neck Surgery, Cincinnati Children's Hospital Medical Center. Department of Otolaryngology Head & Neck Surgery University of Cincinnati Cincinnati Ohio USA
3. Department of Otolaryngology, Head and Neck Surgery, Sleep Surgery Division Stanford University Medical Center Stanford California USA
4. Department of Otolaryngology—Head & Neck Surgery St Vincent's Hospital Sydney Darlinghurst New South Wales Australia
5. Southern New England ENT New Haven Connecticut USA
6. Department of Otolaryngology—Head and Neck Surgery University of Michigan Ann Arbor Michigan USA