1. National Institute for Occupational Safety and Health (NIOSH), Denver, Colorado, USA;
2. NIOSH, Atlanta Field Office, Atlanta, Georgia, USA;
3. NIOSH, Cincinnati, Ohio, USA;
4. Department of Health, Taipei, Taiwan;
5. National Taiwan University, Taipei, Taiwan;
6. Institute of Occupational Safety and Health, Taipei, Taiwan;
7. Taiwan Center for Disease Control, Taipei, Taiwan