Accurate biopsy of bile duct without destroying duodenal papilla

Special Minimally Invasive Surgery, The First Hospital of Lanzhou University, Lanzhou, China; Hepatopancreatobiliary Surgery Institute of Gansu Province, Clinical Medical College Cancer Center of Lanzhou University, Lanzhou, China

Hepatopancreatobiliary Surgery Institute of Gansu Province, Clinical Medical College Cancer Center of Lanzhou University, Lanzhou, China; The Second General Surgery Department, The First Hospital of Lanzhou University, Lanzhou, China