OC.06.4: The Addition of an Immunosuppressant is an Effective Optimization Strategy after Loss of Response to Anti-Tnf Alpha Monotherapy in Patients with Inflammatory Bowel Disease: A Two-Year Experience. (15th March 2017) - Macaluso, F.S.; Sapienza, C.; Ventimiglia, M.; Renna, S.; Rizzuto, G.; Orlando, R.; Affronti, M.; Orlando, E.; Cottone, M.; Orlando, A.