1. Department of Ear, Nose and Throat, Royal Sussex County Hospital, Eastern Road, Brighton BN2 5BE, England.
2. Jiangsu Ear and Hearing Centre, Jiangsu Province Hospital, Nanjing, China.
3. Centro de Audición CEDAF, Guatemala City, Guatemala.
4. Department of Community Medicine, Maulana Azad Medical College, New Delhi, India.
5. School of Medicine and Public Health, University of Newcastle, Callaghan, Australia.