P.02.1 ENDOSCOPIC SUBMUCOSAL DISSECTION IN DYSPLASTIC LESIONS IN LONG-STANDING ULCERATIVE COLITIS: RESULTS OF A TERTIARY ENDOSCOPIC REFERRAL CENTER. (25th March 2019) - Manta, R.; Caruso, A.; Castellani, D.; Bertani, H.; Germani, U.; Mangiafico, S.; Grande, G.; Antonelli, E.; Clerici, C.; Bassotti, G.; Conigliaro, R.