Affiliation: | 1. Department of Physical Medicine and Rehabilitation, Korea University College of Medicine, 73 Inchon-ro, Seongbuk-gu, Seoul, 136-705, South Korea 2. Department of Preventive Medicine, Korean University College of Medicine, 73 Inchon-ro, Seongbuk-gu, Seoul, 136-705, South Korea 3. Department of Physical Medicine and Rehabilitation, Sahmyook Medical Center, Seoul, South Korea
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