title: Health economics with retrospective data: selection bias issues.
authors.forename: K L
authors.initials: KL
authors.lastname: Puder
authors.forename: L L
authors.initials: LL
authors.lastname: Wood
authors.forename: A
authors.initials: A
authors.lastname: Sherrill
mesh_terms: D003363:Cost Control; D006302:Health Services Research / Q000191:economics*; D012189:Retrospective Studies; D015983:Selection Bias