1 Department of Preventive Medicine, Korea University College of Medicine, Seoul, Republic of Korea.
2 Department of Preventive Medicine, Korea University College of Medicine, Seoul, Republic of Korea; Program in Public Health, Korea University Graduate School, Seoul, Republic of Korea.
3 Department of Preventive Medicine, Korea University College of Medicine, Seoul, Republic of Korea; Program in Public Health, Korea University Graduate School, Seoul, Republic of Korea. Electronic address: chun@korea.ac.kr.