1 Department of Family Medicine, Nowon Eulji Medical Center, Eulji University School of Medicine, Seoul, 01830, Republic of Korea. Electronic address: swpapa@eulji.ac.kr.
2 Department of Family Medicine, Yongin Severance Hospital, Yonsei University College of Medicine, Yongin-si, Gyeonggi-do, 16995, Republic of Korea. Electronic address: digda3@yuhs.ac.