Affiliation: | (1) Department of Family Medicine, Soonchunhyang University School of Medicine, 657-58, Hannam-Dong, Yongsan-Ku, Seoul, 140-743, South Korea;(2) Department of Family Medicine, Kwandong University School of Medicine, Myungji Hospital, Hwajeong-Dong, Koyang, Kyunggi-Do, 412-270, South Korea;(3) Department of Geriatric Medicine, Sungnam Hospital, 5113-1, Sungnam, Kyunggi-Do, 461-191, South Korea;(4) Department of Neurology, Ewha University School of Medicine, 911-1, Mok-Dong, Yangchon-Ku, Seoul, 158-710, South Korea;(5) Department of Neurology, Catholic University of Taegu-Hyosung, School of Medicine, 3056-6, Daemyung-4 Dong, Nam-Ku, Taegu, 705-034, South Korea;(6) Department of Family Medicine, Pochon-CHA University School of Medicine, 351, Yatap-Dong, Sungnam, Kyunggi-Do, 463-070, South Korea |