Affiliation: | 1. Department of Occupational and Environmental Medicine, Haeundae Paik Hospital, Inje University, 875, Haeun-daero, Haundae-gu, Busan, 612-896, Republic of Korea 2. Department of Biostatistics and Epidemiology, School of Public Health, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul, 151-742, Republic of Korea 3. Department of Pediatrics, College of Medicine, Hanyang University, Kyoungchun-ro 153, Guri-si, Gyeonggi-do, 471-701, Republic of Korea 4. Department of Preventive Medicine, School of Medicine, Kangwon National University, 1 Kangwondaehak-gil, Chuncheon-si, Gangwon-do, 200-701, Republic of Korea
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