1. Eco-Transport
Research Division, Korea Railroad Research Institute, Uiwang-si, Gyeonggi-do 437-757, Republic of Korea
2. University of Science and Technology, 217 Gajeong-ro,
Yuseong-gu, Daejeon 305-350, Republic of Korea
3. Center
for Environment, Health and Welfare Research, Korea Institute of Science and Technology, Seoul 136-791, Republic of Korea
4. Department
of Bio and Environmental Science, Dongnam Health College, Suwon-si, Gyeonggi-do 440-714, Republic of Korea
5. Department
of Environmental Health and Institute of Health and Environment, Graduate
School of Public Health, Seoul National University, 1 Gwanak-ro, 1 Gwanak-gu, Seoul 151-742, Republic of Korea