P1638: EARLY USE OF ELTROMBOPAG IN ADULT PATIENTS WITH ITP WHO ARE REFRACTORY OR RELAPSED AFTER FIRST-LINE CORTICOSTEROID THERAPY – AN AD HOC ANALYSIS OF THE TAPER TRIAL RESULTS. (23rd June 2022) - Ghanima, W.; Zaja, F.; Maier, J.; Haenig, J.; Lee, J.; Cooper, N.