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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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