Dilation of the cystic duct confluence in laparoscopic common bile duct exploration and stone extraction in patients with secondary choledocholithiasis oleh Xiao-Bin Yang, An-Shu Xu, Jian-Gang Li, Yong-Ping Xu, De-Song Xu, Chao-Chun Fu, Da-Bo Deng, Jie Li, Ma-Zhong Zhang