Department of Internal Medicine, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul 135-720, South Korea
Department of Internal Medicine, Dongguk University Ilsan Hospital, Dongguk University College of Medicine, Gyeonggi-do 410-773, South Korea
Department of Internal Medicine, Inje University Sanggye Paik Hospital, Inje University College of Medicine,Seoul 139-707, South Korea
Department of Internal Medicine, Kwandong University Myungji Hospital, Kwandong University College of Medicine, Gyeonggi-do 412-270, South Korea
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