1 Department of Environmental Health Sciences, Seoul National University Graduate School of Public Health, Seoul, Korea (the Republic of).
2 Department of Occupational and Environmental Medicine, Korea University Ansan Hospital, Ansan, Gyeonggi-do, Korea (the Republic of).
3 Institute of Health and Environment, Seoul National University, Seoul, Korea (the Republic of).
4 Department of Environmental Health Sciences, Seoul National University Graduate School of Public Health, Seoul, Korea (the Republic of) [email protected].