References
- Barton GR, Davis AC, Parving A, Roine R, Sorri M, Stilven S. Cross-sectional survey of adult hearing aid services in Denmark, Finland and the UK. Audiol Med 2003; 1: 107–14.
- World Health Organization. Guidelines for hearing aids and services for developing countries. Prevention of blindness and deafness. Hearing Aids Working Group. Report No. PBD/PDH/01.1. Geneva, Switzerland: WHO; 2001.
- Sullivan RF. An acoustic coupling-based classification system for hearing aid fittings. Hear Instrum 1985; 36: 25–32.
- Parving A. The value of speech audiometry in hearing-aid rehabilitation. Scand Audiol 1991; 20: 159–64.
- International Organisation for Standardization. Acoustics—audiometric test methods. Part I. Basic pure-tone air and bone conduction threshold audiome-try. Report No. ISO 8253 1–3. Geneva, Switzerland: ISO; 2000.
- International Organisation for Standardization. Acoustics—reference zero for the calibration of audio-metric equipment. Reference equivalent threshold force levels for pure tones and bone vibrators. Report No. ISO 3891–3. Geneva, Switzerland: ISO; 1994.
- Byrne D, Dillon H. The National Acoustic Labora-tories' (NAL) new procedure for selecting the gain and frequency response of a hearing aid. Ear Hear 1986; 7: 257–65.
- Cox RM, Hyde M, Gatehouse S, Noble W, Dillon H, Bentler R, et al. Optimal outcome measures, research priorities, and international cooperation. Ear Hear 2000; 21: 106–15.
- Cox RM, Alexander CG. The International Outcome Inventory for Hearing Aids (I0I-HA): psychometric properties of the English version. J Audiol 2002; 41: 30–5.
- Parving A, Sibelle P. Clinical study of hearing instruments: a cross-sectional longitudinal audit based on consumer experiences. Audiology 2001; 40: 43–53.
- Sibelle P, Parving A. An audit of hearing aid quality in Denmark II: type of defects. Br J Audiol 1994; 28: 141–8.
- Moore BCJ, Stone MA, Alcantara H. Comparison of the electroacoustic characteristics of five hearing aids. Br J Audiol 2001; 35: 307–25.