TY - JOUR JO - Videosurgery and Other Miniinvasive Techniques SN - 1895-4588 VL - 17 IS - 2 PY - 2022 ID - Chen2022 TI - Risk prediction models for difficult cholecystectomy AU - Chen, Gan AU - Li, Min AU - Cao, Baoqiang AU - Xu, Qingwen AU - Zhang, Zhigong SP - 303 EP - 308 DA - 2022 DO - 10.5114/wiitm.2022.114539 UR - http://dx.doi.org/10.5114/wiitm.2022.114539 ER -