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1. Joongmoon college of medicine Gumi CHA hospital,Kyungsangbukdo, South Korea, 2. Daegu Catholic university, Deagu, South Korea, 3. Dongguk university, Kyungsangbukdo, South Korea, 4. Kyoungpook national university, Deagu, South Korea, 5. College of Medicine, Yeungnam University, Daegu, South Korea
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