1. Department of Internal Medicine, Soonchunhyang University Bucheon Hospital, Soonchunhyaung University College of Medicine, Bucheon 14584, Republic of Korea
2. Department of Medical Library, Soonchunhyang University Bucheon Hospital, Soonchunhyaung University College of Medicine, Bucheon 14584, Republic of Korea
3. Department of General Surgery, Soonchunhyang University Bucheon Hospital, Soonchunhyaung University College of Medicine, Bucheon 14584, Republic of Korea