2853346 IDBS indeterminate biliary strictures 6 2844938 IBDS indeterminate biliary strictures 5 1089384 IBS indeterminate biliary strictures 3 3580017 IDBSs indeterminate biliary strictures 3 2846421 IBSs indeterminate biliary strictures 1 3456531 IBStr indeterminate biliary strictures 1