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Gray correlation analysis and trend prediction on average general hospitalization expenses: example of joint replacement patients
Hou Jifei1, Hu Chuan2, Wang Yue,3 Li Jing4, Zhang Yun5.  
1.Medical Department of Qingdao University, Qingdao 266000, China; 
2.The  Affiliated Hospital of Qingdao University, Qingdao 266000, China .
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