title: Statistical issues with the analysis of nonrandomized studies in comparative effectiveness research.
authors.affiliation: Pfizer, Inc, 235 East 42nd Street, New York, NY 10017, USA. Demissie.Alemayehu@pfizer.com
authors.forename: Demissie
authors.initials: D
authors.lastname: Alemayehu
authors.forename: Jose Ma J
authors.initials: JM
authors.lastname: Alvir
authors.forename: Byron
authors.initials: B
authors.lastname: Jones
authors.forename: Richard J
authors.initials: RJ
authors.lastname: Willke
mesh_terms: D015982:Bias; D057186:Comparative Effectiveness Research / Q000706:statistics & numerical data* / Q000639:trends; D006801:Humans; D012107:Research Design / Q000706:statistics & numerical data*