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| Study on Application of Serum TK1 Combined with CEA, CA125 and CA19-9 in Screening the Risk of Gastrointestinal Tumor |
| WU Shanshan, YAN Jianqin, LIU Zhoufa |
| First-author's address: Health Examination Department, Pingxiang People's Hospital, Pingxiang 337000, China |
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