Development and validation of a novel nomogram to predict worsening of gastroesophageal reflux symptoms after laparoscopic sleeve gastrectomy using Lasso-logistic regression by Lei Jin, Xiao-Kun Huang, Zhen-Yu Gao, Jing Gu, Zhe Zhang, Fei-Qi Xu, Ying Li, Hao-Peng Zhu, Cheng-Fei Du, Jun-Wei Liu, Lei Liang, Zhi-Fei Wang, Xiao-Dong Sun, Zun-Qiang Xiao, Yao-Juan Wu

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