Effectiveness of gemcitabine, pegaspargase, cisplatin, and dexamethasone (DDGP) combination chemotherapy in the treatment of relapsed/refractory extranodal NK/T cell lymphoma: a retrospective study of 17 patientsZhi‐Yuan Zhou, Mingzhi Zhang, Changying Chen et al.|Annals of Hematology|2014Cited by 52