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1. School of medicine CHA university, Gyeongsangbukdo, South Korea, 2. School of medicine CHA university,Gyeongsangbukdo, South Korea, 3. School of medicine, Kyungpook national university,Daegu, South Korea, 4. Dongguk university, Gyeongsangbukdo, South Korea, 5. College of Medicine, Yeungnam University, Daegu, South Korea, 6. Daegu Catholic university, Daegu, South Korea, 7. College of medicine, Keimyung University, Daegu, South Korea
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