Quantitative assessment of unobserved confounding is mandatory in nonrandomized intervention studies.
R. Groenwold, E. Hak, and A. Hoes. Journal of clinical epidemiology, 62 (1):
22-8(January 2009)4688<m:linebreak></m:linebreak>JID: 8801383; 2007/03/12 received; 2008/01/28 revised; 2008/02/26 accepted; 2008/07/10 aheadofprint; ppublish;<m:linebreak></m:linebreak>Mesures d'associació.
DOI: 10.1016/j.jclinepi.2008.02.011
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