Protocol for the CREST Choles (Chinese REgistry Study on Treatment of Cholecysto-Choledocholithiasis) study: an ambispective, multicenter, observational, open-cohort study by Xun Li, Fei Li, Li Yang, Houbao Liu, Siyan Zhan, Shanshan Wu, Jie-Gao Zhu, Qiushi Feng, Dianrong Xiu, Haidong Tan, Jianzhu Fu, Dong Shang, Binglu Li, Yuanyuan Kong, Wei Guo, Zhong-Tao Zhang

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