T.02.9 SAFETY AND EFFECTIVENESS OF DILATION-ASSISTED STONE EXTRACTION IN ELDERLY PATIENTS WITH DIFFICULT COMMON BILE DUCT STONES: 5 YEARS-EXPERIENCE OF A SINGLE REFERRAL CENTER. (May 2022) - Gagliardi, M.; Abbatiello, C.; Fusco, M.; Labianca, O.; Sica, M.; Zulli, C.; Maurano, A.