1. Department of Family Medicine, Seoul National University Hospital, Seoul, Korea
2. Department of Biomedical Sciences, Seoul National University Graduate School, Seoul, Korea
3. Department of Medicine, Mount Sinai Beth Israel Icahn School of Medicine at Mount Sinai, New York, New York
4. Department of Family Medicine, Korea University Guro Hospital, Seoul, Korea
5. National Cancer Control Institute, National Cancer Center, Goyang-si, Gyeonggi-do, Korea