364. LATE-ONSET NEUTROPENIA IN PATIENTS UNDERGOING RITUXIMAB-INDUCED CONTINUOUS B CELL DEPLETION FOR AUTOIMMUNE DISEASE: DATA FROM A 738 PATIENT COHORT AND APPROACH TO MANAGEMENT. (29th March 2019) - Zonozi, Reza; Laliberte, Karen; Rosenthal, Jillian; Huizenga, Noah; Cortazar, Frank; Niles, John