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Frequency of T/NK cell lymphoma subtypes in six geographic areas in Japan from 2007‐2014. ATLL: adult T‐cell leukemia/lymphoma; AITL: angioimmunoblastic T‐cell lymphoma; PTCL‐NOS: peripheral T‐cell lymphoma, not otherwise specified; ACLC: anaplastic large cell lymphoma; ALK: anaplastic lymphoma kinase; NK: natural killer; Others: other T/NK‐cell malignancies
