1. Department of Occupational Safety and Health, College of Public Health, China Medical University, Taichung, Taiwan
2. Institute of Epidemiology and Preventive Medicine and Research Center for Genes, Environment and Human Health, College of Public Health, National Taiwan University, Taipei, Taiwan
3. Center for Environmental and Respiratory Health Research, Institute of Health Sciences, University of Oulu, Oulu, Finland
4. Institute of Occupational and Environmental Medicine, University of Birmingham, Birmingham, United Kingdom