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1. School of medicine, CHA university,Gyeongsangbukdo, Korea, 2. School of medicine, Kyungpook national university,Daegu, Korea, 3. Dongguk university, Gyeongsangbukdo, Korea, 4. Daegu Catholic university, Daegu, Korea, 5. College of Medicine, Yeungnam University, Daegu, Korea, 6. College of medicine, Keimyung University, Daegu, Korea
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