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Speizer FE, Doll R.Speizer FE, et al.Br Med J. 1968 Jul 27;3(5612):245-6. doi: 10.1136/bmj.3.5612.245.Br Med J. 1968.PMID: 4874169Free PMC article.No abstract available.
Speizer FE, Doll R, Heaf P.Speizer FE, et al.Br Med J. 1968 Feb 10;1(5588):335-9. doi: 10.1136/bmj.1.5588.335.Br Med J. 1968.PMID: 5317525Free PMC article.
Speizer FE, Doll R, Heaf P, Strang LB.Speizer FE, et al.Br Med J. 1968 Feb 10;1(5588):339-43. doi: 10.1136/bmj.1.5588.339.Br Med J. 1968.PMID: 5317526Free PMC article.