title: The Reliability of Instrumental Variables in Health Care Effectiveness Research: Less Is More.
authors.affiliation: Harvard Medical School Department of Population Medicine and Harvard Pilgrim Health Care Institute, Landmark Center, Boston, MA.
authors.forename: Stephen B
authors.initials: SB
authors.lastname: Soumerai
authors.affiliation: University of Pennsylvania, Sociology Department, Philadelphia, PA.
authors.forename: Ross
authors.initials: R
authors.lastname: Koppel
mesh_terms: D057186:Comparative Effectiveness Research / Q000379:methods*; D005260:Female; D006302:Health Services Research / Q000379:methods*; D006801:Humans; D064887:Observational Studies as Topic; D017063:Outcome Assessment, Health Care; D012107:Research Design