1. Division of Cancer Registration and Surveillance, National Cancer Control Institute, National Cancer Center, Goyang, Korea.
2. Department of Preventive Medicine, Chonnam National University Medical School, Hwasun, Korea.
3. Department of Preventive Medicine & Institute of Wonkwang Medical Science, Wonkwang University College of Medicine, Iksan, Korea.
4. Department of Preventive Medicine, Chungnam National University School of Medicine, Daejeon, Korea.
5. Department of Preventive Medicine, Chosun University College of Medicine, Gwangju, Korea.