Lenalidomide (Len) Refractory MM Patients' Outcomes. - Gkioka, Annita Ioanna; Repousis, Panagiotis; Rougkala, Niki; Asmanis, Evangelos; Bartzi, Vasiliki; Dimou, Maria; Iliakis, Theodoros; Vyniou, Nora Athina; Panayiotidis, Panayiotis; Kyrtsonis, Mariechristine (Clinical lymphoma, myeloma & leukemia, 2019)