1. Institute of Environmental and Occupational Health Sciences, National Yang Ming Chiao Tung University, Taipei City, Taiwan (ROC).
2. Department of Pediatrics, Taipei Hospital, Ministry of Health and Welfare, New Taipei City, Taiwan (ROC).
3. School of Medicine, National Yang Ming Chiao Tung University, Taipei 112, Taiwan.
4. College of Public Health, China Medical University, Taichung 40402, Taiwan.
5. National Institute of Environmental Health Sciences, National Health Research Institutes, Miaoli, Taiwan.