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Oken MM, Kyle RA, Greipp PR, Kay NE, Tsiatis A, Gregory SA, Spiegel R J, O'Connell M J.Oken MM, et al. Among authors: greipp pr.Leuk Lymphoma. 1996 Feb;20(5-6):447-52. doi: 10.3109/10428199609052427.Leuk Lymphoma. 1996.PMID: 8833401Clinical Trial.