1. UCL Ear Institute, University College London, London, UK
2. Queen Elizabeth Central Hospital, Blantyre, Malawi
3. Veterans Health Administration, Veterans Affairs Southern Nevada Health Care System, Audiology Clinic, North Las Vegas, NV, USA
4. International Centre for Evidence in Disability, London School of Hygiene & Tropical Medicine, London, UK
5. Department of Surgery, College of Medicine, University of Malawi, Blantyre, Malawi