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Richards F 2nd, Perry DJ, Goutsou M, Modeas C, Muchmore E, Rege V, Chahinian AP, Hirsh V, Poiesz B, Green MR.Richards F 2nd, et al. Among authors: hirsh v.Cancer. 1991 Jun 15;67(12):2974-9. doi: 10.1002/1097-0142(19910615)67:12<2974::aid-cncr2820671206>3.0.co;2-x.Cancer. 1991.PMID: 1646066Clinical Trial.