1. The Swedish Institute for Disability Research, Örebro University, Örebro, Sweden
2. Audiological research centre,University hospital, Faculty of Medicine and Health, Örebro University, Örebro, Sweden
3. University Health Care Research Centre, Faculty of Medicine and Health, Örebro University, Örebro, Sweden
4. The Swedish National Resource Centre for Deafblindness, Lund, Sweden