We found a matchYour institution may have access to this item. Find your institution then sign in to continue.TitleIntroduction to propensity scores: A case study on the comparative effectiveness of laparoscopic vs open appendectomy.AuthorsHemmila MR; Birkmeyer NJ; Arbabi S; Osborne NH; Wahl WL; Dimick JBPublicationArchives of surgery (Chicago, Ill. : 1960), 2010, Vol 145, Issue 10, p939ISSN1538-3644Publication typearticleDOI10.1001/archsurg.2010.193