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Journal of the National Cancer Institute Advance Access originally published online on June 22, 2009
JNCI Journal of the National Cancer Institute 2009 101(14):1029-1030; doi:10.1093/jnci/djp154
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© The Author 2009. Published by Oxford University Press.

CORRESPONDENCE

Re: Promoting Regular Mammography Screening I. A Systematic Assessment of Validity in a Randomized Trial

Jim McCambridge, Kyp Kypri, John Attia, Diana Elbourne

Affiliations of authors: Centre for Research on Drugs and Health Behaviour, Department of Public Health and Policy (JMcC), and Medical Statistics Unit, Department of Epidemiology and Population Health (DE), London School of Hygiene and Tropical Medicine, London, UK; Centre for Clinical Epidemiology and Biostatistics, School of Medicine and Public Health, University of Newcastle, New South Wales, Australia (KK, JA)

Correspondence to: Jim McCambridge, PhD, Centre for Research on Drugs and Health Behaviour, Department of Public Health and Policy, London School of Hygiene and Tropical Medicine, Keppel St, London WC1E 7HT, UK (e-mail: jim.mccambridge@lshtm.ac.uk).

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We congratulate del Junco et al. (1) for undertaking a dedicated study of validity in their mammography screening trial. We are particularly interested in their randomized studies of the possible effects of completing baseline surveys and in their conceptualization of validity. The study population was randomly sampled, and screening rates in the assessed control group . . . [Full Text of this Article]


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