食管癌高发区重度不典型增生人群γ-谷氨酰转肽酶的随访观察
식관암고발구중도불전형증생인군γ-곡안선전태매적수방관찰
Follow-up on the γ-Glutamyl Transpeptidase in Subjects with Severe Dysplasia in High Incidence Area of Esophageal Cancer
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