1. Department of Family Medicine, Ilsan-Paik Hospital, College of Medicine, Inje University, Goyang, Korea
2. Department of Family Medicine, Dongguk University Ilsan Hospital, Goyang, South Korea
3. Department of Medicine, School of Medicine, Dongguk University, Seoul, South Korea
4. Duke Cancer Institute, Duke University School of Medicine, Durham, NC, USA
5. Department of Cancer Control and Population Health, National Cancer Center, Graduate School of Cancer Science, Goyang, South Korea
6. Graduate School, Yonsei University College of Nursing, Seoul, South Korea
7. Department of Statistics, Dongguk University, Seoul, South Korea