1. Department of Otolaryngology - Head & Neck Surgery; Auckland City Hospital; Auckland New Zealand
2. Department of Otolaryngology - Head & Neck Surgery; North Shore Hospital; Auckland New Zealand
3. Department of Ear Nose and Throat Surgery; Barking Havering and Redbridge NHS Trust; Romford UK
4. Dr Foster Intelligence Ltd; London UK
5. Dr Foster Unit at Imperial College; Department of Primary Care and Public Health; Imperial College London; London UK
6. Academic Surgical Unit; Department of Surgery & Cancer; Imperial College Healthcare Trust; St Mary's Hospital; London UK
7. Department of Otolaryngology - Head & Neck Surgery; St Mary's Hospital; London UK