Concomitant transformation of monoclonal gammopathy of undetermined significance to multiple myeloma and of essential thrombocythemia to acute biphenotypic leukemia 37 years after initial diagnosis - Niscola, Pasquale (Korean Society of Hematology; Korean Society of Blood and Marrow Transplantation; Korean Society of Pediatric Hematology-Oncology; Korean Society on Thrombosis and Hemostasis, 2013)