Furthermore, the investigators will evaluate various parameters to clarify the predictive factors of pancreatitis and cholecystitis. The following 10 variables will be evaluated in pancreatitis by univariate analysis: [1] sex, [2] age, [3] primary disease, [4] Covered type (partially or fully), [5] SEMS with high AF, [6] F-CSEMS with high RF, [7] EST before F-CSEMS, [8] previous biliary stent, [9] contrast injection into the pancreatic duct (pancreatogram), and [10] the position of the distal stent edge.