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  1. Klim Mcpherson, Professor of public health epidemiology
  1. Health Promotion Sciences Unit, Department of Public Health and Policy, London School of Hygiene and Tropical Medicine, London WC1E 7HT

    EDITOR,--In general I agree with David A Viniker. The finding of an apparent deficit in the case fatality from breast cancer among women who take supplements when there is evidence of an increased incidence is to be expected early in a study because of likely selection and surveillance biases.1 Proving a real effect is therefore difficult.

    Jules Alterman points out that patients might prefer an easy death from coronary heart disease rather than a traumatic death …

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