1. Royal National Throat, Nose and Ear Hospital, University College London Hospitals NHS Trust, London, England
2. Duke Skull Base Center, Duke University School of Medicine, Durham, North Carolina
3. Departments of Anesthesiology and Medicine, and Center for Hyperbaric Medicine and Environmental Physiology, Duke University School of Medicine, Durham, North Carolina
4. Department of Otolaryngology, Addenbrooke's Hospital, Cambridge, England
5. currently in private practice, Munich, Germany
6. City, University of London, London, England