1. Finnish Institute of Occupational Health; Cochrane Occupational Safety and Health Review Group; PO Box 310 Kuopio Finland 70101
2. Corporacio Sanitaria Parc Tauli de Sabadell; Prevention Service; Parc Tauli s/n Sabadell Catalonia Spain 08208
3. Pompeu Fabra University; CiSAL - Centre for Occupational Health; PRBB Buildinng Dr Aiguader, 88 Barcelona Spain 08003
4. Parc de Salut MAR; Occupational Health Service; Passeig Marítim de la Barceloneta, 25-29 Barcelona Spain 08003
5. CIBER Epidemiología y Salud Pública (CIBERESP); () Spain