Address correspondence to Jin-Su Choi, Department of Preventive Medicine, Chonnam National University College of Medicine, Chonnam National University Research Center of Medical Sciences, 5, Hak-dong, Dong-gu, Gwangju 501-746, South Korea. E-mail:
Authors’ addresses: Sun-Seog Kweon, Jeonnam Regional Cancer Center, Chonnam National University Hwasun Hospital, 160, Ilsim-Ri, Hwasun, Jeonnam 519-809, South Korea, E-mail:
Financial support: This study was supported by the Korea Centers for Disease Control and Prevention.
Disclaimer: The authors have no conflicts of interests in relation to this study.
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