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3. Application of the Minnesota Code to population studies of the electrocardiogram in the elderly;Kennedy, R.D.; Caird, F.I.;Gerontologia Clinica,1972
4. Method of sampling in a study of older people with a comparison of respondents and non-respondents;Milne, J.S.; Maule, M.M.; Williamson, J.;British Journal of Preventive and Social Medicine,1971
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