1. School of Public Health, China Medical University, Shenyang, China,
2. Department of Health Sciences, Oita University of Nursing and Health Sciences, Oita, Japan,
3. Department of Immunology and Parasitology, School of Medicine, University of Occupational and Environmental Health, Fukuoka, Japan,
4. Environmental Health Division, Department of Environmental Engineering, Graduate School of Engineering, Kyoto University, Kyoto, Japan, and
5. Department of Environmental Toxicology, University of California, Davis, CA, USA