| Affiliation: | 1. Department of Pediatrics, School of Medicine, Ewha Womans University, Seoul, Korea;2. Department of Preventive Medicine and Ewha Medical Research Institute, School of Medicine, Ewha Womans University, Seoul, Korea;3. Department of Preventive Medicine, Seoul National University College of Medicine, Seoul, Korea;4. Department of Preventive Medicine, Dankook University College of Medicine, Cheonan, Korea;5. Department of Occupational and Environmental Medicine, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Korea;6. Environmental Health Research Division, National Institute of Environmental Research, Incheon, South Korea |
