1 Department of Preventive Medicine, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Republic of Korea.
2 2Department of Preventive Medicine, University of Ulsan College of Medicine, Seoul, Republic of Korea.
3 3Environmental Health Center, University of Ulsan College of Medicine, Ulsan, Republic of Korea.
4 Department of Occupational and Environmental Medicine, Ulsan University Hospital, University of Ulsan College of Medicine, 877 Bangeojinsunhwan-doro, Dong-gu, Ulsan, 44033 Republic of Korea.
5 5Department of Atmospheric Sciences, Pusan National University, Busan, Republic of Korea.