Multicenter external validation of a nomogram predicting conversion to open cholecystectomy during laparoscopic surgery for acute calculous cholecystitis: a cross-sectional study by Hongsheng Wu, Keqiang Ma, Biling Liao, Tengfei Ji, Zongmin Zheng, Yong Yan, Jiongbiao Yu, Haitao Yu, Yue Liu, Yanyuan Zhou, Guangrong Huang, Weili Gu, Tiansheng Cao

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