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Walker M, Shaper AG, Phillips AN, Cook DG.Walker M, et al. Among authors: phillips an.Int J Epidemiol. 1989 Sep;18(3):602-6. doi: 10.1093/ije/18.3.602.Int J Epidemiol. 1989.PMID: 2807663
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Walker M, Shaper AG, Phillips AN, Cook DG.Walker M, et al. Among authors: phillips an.Am J Epidemiol. 1991 Feb 15;133(4):411-2. doi: 10.1093/oxfordjournals.aje.a115899.Am J Epidemiol. 1991.PMID: 1994706No abstract available.