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Porter PL, El-Bastawissi AY, Mandelson MT, Lin MG, Khalid N, Watney EA, Cousens L, White D, Taplin S, White E.Porter PL, et al.J Natl Cancer Inst. 1999 Dec 1;91(23):2020-8. doi: 10.1093/jnci/91.23.2020.J Natl Cancer Inst. 1999.PMID: 10580027