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Friday the 13th

BMJ 1994; 308 doi: (Published 26 March 1994) Cite this as: BMJ 1994;308:859
  1. S J Iversen
  1. Steyning, West Sussex BN44 3NH.

    Editor,--C D O'Brien states that “actuarial investigation has shown that the 13th of a month is more likely to be a Friday than any other …

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