1. Stockport NHS Foundation Trust, Stepping Hill Hospital; Department of Otolaryngology, Head & Neck Surgery; Poplar Grove Hazel Grove Stockport UK SK2 7JE
2. Derriford Hospital; Department of Otolaryngology, Head & Neck Surgery; Derriford Road Crownhill Plymouth UK PL6 8DH
3. Royal Free Hospital; UCL Ear Institute & The Royal National Throat, Nose & Ear Hospital; 330 Gray's Inn Road London UK WC1X 8DA