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Lurie JD, Welch HG.Lurie JD, et al. Among authors: welch hg.J Natl Cancer Inst. 1999 Oct 6;91(19):1641-6. doi: 10.1093/jnci/91.19.1641.J Natl Cancer Inst. 1999.PMID: 10511591
Black WC, Haggstrom DA, Welch HG.Black WC, et al. Among authors: welch hg.J Natl Cancer Inst. 2002 Feb 6;94(3):167-73. doi: 10.1093/jnci/94.3.167.J Natl Cancer Inst. 2002.PMID: 11830606
Welch HG, Black WC.Welch HG, et al.J Natl Cancer Inst. 2002 Jul 17;94(14):1066-70. doi: 10.1093/jnci/94.14.1066.J Natl Cancer Inst. 2002.PMID: 12122097