Institution: | 1. Department of Environmental Health, Korea University, Seoul, South Korea;2. Department of Occupational Health, Catholic University of Daegu, Hayang-eup, Gyeongsan-si, Kyongbuk 712-702, South Korea;3. Department of Environmental Health, Soonchunhyang University, Chungnam, South Korea;4. School of Architecture, Chungang University, Seoul, South Korea |