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The possibility of unmeasured confounding variables in observational studies: a forgotten fact?
- Correspondence to P Michael Ho, 1055 Clermont St. Denver, CO 80220, USA; michael.ho{at}coloradooutcomes.org
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The possibility of unmeasured confounding variables in observational studies: a forgotten fact?
Publication history
- First published July 27, 2011.
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May 30, 2016
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© 2011, Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://group.bmj.com/group/rights-licensing/permissions.