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Marcus PM, Bergstralh EJ, Fagerstrom RM, Williams DE, Fontana R, Taylor WF, Prorok PC.Marcus PM, et al. Among authors: prorok pc.J Natl Cancer Inst. 2000 Aug 16;92(16):1308-16. doi: 10.1093/jnci/92.16.1308.J Natl Cancer Inst. 2000.PMID: 10944552Clinical Trial.