Key points are not available for this paper at this time.
Consequences of research participation for behaviors being investigated do exist, although little can be securely known about the conditions under which they operate, their mechanisms of effects, or their magnitudes. New concepts are needed to guide empirical studies.
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Jim McCambridge
John Witton
Diana R Elbourne
Journal of Clinical Epidemiology
King's College London
London School of Hygiene & Tropical Medicine
University of London
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McCambridge et al. (Fri,) studied this question.
www.synapsesocial.com/papers/69d738ff3f2a6ac123b8aa44 — DOI: https://doi.org/10.1016/j.jclinepi.2013.08.015