Vorinostat Completed Phase 2 Trials for Adult Lymphocyte Depletion Hodgkin Lymphoma / Adult Nodular Sclerosis Hodgkin Lymphoma / Adult Unfavorable Prognosis Hodgkin Lymphoma / Recurrent Adult Hodgkin's Lymphoma / Adult Nodular Lymphocyte Predominant Hodgkin Lymphoma / Adult Lymphocyte Predominant Hodgkin Lymphoma / Adult Favorable Prognosis Hodgkin Lymphoma / Adult Mixed Cellularity Hodgkin Lymphoma Treatment