Institution: | 1. Department of Family Medicine, Chung-Ang University Medical Center, 221 Heukseok-dong, Dongjak-gu, 156-756, Seoul, Republic of Korea;2. Department of Family Medicine, Kwandong University College of Medicine, 697-24 Hwajung-dong, Dukyang-gu, Goyang, Kyungki-do, Republic of Korea;3. Sports and Medicine Research Center, INTOTO Inc., 1111, Le Meilleur 3, ChangChun-Dong, Seodaemun-Gu, Seoul, Republic of Korea;4. Department of Family Medicine, Severance Hospital, Yonsei University, College of Medicine, 250 Seongsanno, Seodaemun-gu 120-752, Seoul, Republic of Korea |