title: Assessing Statistical Methods for Causal Inference in Observational Data.
authors.affiliation: GlaxoSmithKline, Collegeville, PA, USA.
authors.forename: D C
authors.initials: DC
authors.lastname: Parks
authors.affiliation: GlaxoSmithKline, Collegeville, PA, USA.
authors.forename: X
authors.initials: X
authors.lastname: Lin
authors.affiliation: GlaxoSmithKline, Collegeville, PA, USA.
authors.forename: K R
authors.initials: KR
authors.lastname: Lee