[1] Imperial Coll London, Resp Epidemiol Occupat Med & Publ Hlth, London, England
[2] Univ Utrecht, Inst Risk Assessment Sci, Utrecht, Netherlands
[3] Erasmus MC, Dept Publ Hlth, Rotterdam, Netherlands
[4] Univ Milan, S Paolo Hosp, Dept Hlth Sci, Milan, Italy
[5] Int Ctr Rural Hlth, Milan, Italy
[6] Natl Inst Occupat Safety & Hlth, Ctr Dis Control & Prevent, Resp Hlth Div, Morgantown, WV USA
[7] Int Agcy Res Canc, Lyon, France
[8] Univ Cape Town, Sch Publ Hlth & Family Med, Occupat Med Div, Cape Town, South Africa
[9] Netherlands Expertise Ctr Occupat Resp Disorders, Utrecht, Netherlands
[10] Finnish Inst Occupat Hlth, Helsinki, Finland
[11] Univ Autonoma Madrid, Fdn Jimenez Diaz, Fac Med, Allergy Serv,CIBER Resp Dis, Madrid, Spain
[12] Aarhus Univ, Danish Ramazzini Ctr, Dept Publ Hlth, Sect Environm, Aarhus, Denmark
[13] Natl Res Ctr Working Environm, Copenhagen, Denmark