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Culbert SJ, Shuster JJ, Land VJ, Wharam MD, Thomas PR, Nitschke R, Pinkel D, Vietti TJ.Culbert SJ, et al. Among authors: land vj.Cancer. 1991 Jan 1;67(1):37-42. doi: 10.1002/1097-0142(19910101)67:1<37::aid-cncr2820670108>3.0.co;2-#.Cancer. 1991.PMID: 1985721Clinical Trial.