1. Finnish Institute of Occupational Health; Cochrane Work Review Group; TYÖTERVEYSLAITOS Finland FI-70032
2. Tronada Consult; Doetinchem Netherlands
3. National Institute for Occupational Safety and Health (NIOSH); Cincinnati OH USA
4. Academic Medical Centre; Clinical & Experimental Audiology; Meibergdreef 9 Amsterdam Netherlands 1105 AZ
5. Universidade Federal da Bahia; Department of Speech and Hearing Sciences; Av Reitor Miguel Calmon, sn Instituto de Ciencias da Saude, Vale do Canela Salvador Bahia Brazil 40110-902