We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleComparing treatments using observational study designs: what can we do about selection bias?AuthorsDimick JB; Livingston EHPublicationArchives of surgery (Chicago, Ill. : 1960), 2010, Vol 145, Issue 10, p927ISSN1538-3644Publication typearticleDOI10.1001/archsurg.2010.223