1. Department of Family Medicine, Chungbuk National University Hospital , Cheongju , Republic of Korea
2. Department of Information & Statistics, Chungbuk National University , Cheongju , Republic of Korea
3. Department of Nursing, College of Nursing, Mo-Im Kim Nursing Research Institute, Yonsei University , Seoul , Republic of Korea
4. Department of Family Medicine, Chungbuk National University College of Medicine , Cheongju, Chungbuk , Republic of Korea