1. Institute of Occupational Medicine and Industrial Hygiene, College of Public Health; National Taiwan University; No. 17, ShiuJou Rd. Taipei 10055 Taiwan
2. Institute of Environmental Health, College of Public Health; National Taiwan University; No. 17, ShiuJou Rd. Taipei 10055 Taiwan
3. National Environmental Health Research Center, National Health Research Institutes; No. 35, Keyan Rd. Zhunan Miaoli County 35053 Taiwan
4. Institute of Epidemiology and Preventive Medicine, College of Public Health; National Taiwan University; No. 17, ShiuJou Rd. Taipei 10055 Taiwan
5. School of Chinese Medicine; China Medical University; Taichung 404 Taiwan