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Department of Internal Medicine, Yonsei University College of Medicine, 8th Floor Annex Building, Yongdong Severance Hospital, 146-92 Dogok-dong, Kangnam-gu, Seoul 120-752, Republic of Korea
Cancer Metastasis Research Center, Yonsei University College of Medicine, Seoul, Republic of Korea
The Institute of Chest Diseases, Yonsei University College of Medicine, Seoul, Republic of Korea
Department of Internal Medicine, Yonsei University College of Medicine, 8th Floor Annex Building, Yongdong Severance Hospital, 146-92 Dogok-dong, Kangnam-gu, Seoul 120-752, Republic of Korea
The Institute of Chest Diseases, Yonsei University College of Medicine, Seoul, Republic of Korea
Department of Internal Medicine, Yonsei University College of Medicine, 8th Floor Annex Building, Yongdong Severance Hospital, 146-92 Dogok-dong, Kangnam-gu, Seoul 120-752, Republic of Korea
The Institute of Chest Diseases, Yonsei University College of Medicine, Seoul, Republic of Korea
Department of Internal Medicine, Yonsei University College of Medicine, 8th Floor Annex Building, Yongdong Severance Hospital, 146-92 Dogok-dong, Kangnam-gu, Seoul 120-752, Republic of Korea
The Institute of Chest Diseases, Yonsei University College of Medicine, Seoul, Republic of Korea
Department of Internal Medicine, Yonsei University College of Medicine, 8th Floor Annex Building, Yongdong Severance Hospital, 146-92 Dogok-dong, Kangnam-gu, Seoul 120-752, Republic of Korea
Brain Korea 21 Project for Medical Sciences, Yonsei University College of Medicine, Seoul, Republic of Korea