1. Department of Pneumoconiosis, Institute of Occupational Diseases, Zhejiang Academy of Medical Sciences, Hangzhou, Zhejiang, PR China
2. Jiading District Center for Disease Control & Prevention, Shanghai, PR China
3. Department of Molecular Environmental Biology, College of Natural Resources, University of California, Berkeley, CA 94720, USA
4. Department of Environmental Health, Harvard T.H. Chan School of Public Health, Boston, MA 02115, USA
5. Department of Surgery, Children’s Hospital Los Angeles, University of Southern California Keck School of Medicine, Los Angeles, CA 90027, USA