Validating the Performance of a Prediction Model for Spontaneous Ureteral Calculus Passage Using Artificial Neural Network：a Multicenter Clinical Trial　
ZENG Kai，WANG Xinmin，NI Zhao，WANG Qinzhang，LI Qiang
Chinese General Practice . 2021, (23): 3005 -3008 .  DOI: 10.12114/j.issn.1007-9572.2021.01.203

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