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Morris JK, Cook DG, Walker M, Shaper AG.Morris JK, et al. Among authors: walker m.J Public Health Med. 1992 Jun;14(2):131-7.J Public Health Med. 1992.PMID: 1515196
Pocock SJ, Shaper AG, Phillips AN, Walker M, Whitehead TP.Pocock SJ, et al. Among authors: walker m.Br Med J (Clin Res Ed). 1986 Feb 22;292(6519):515-9. doi: 10.1136/bmj.292.6519.515.Br Med J (Clin Res Ed). 1986.PMID: 3081149Free PMC article.
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