title: Evaluating Changes in Health Care Policy: Methods Matter.
authors.affiliation: Department of Health Policy and Management, Johns Hopkins School of Public Health, Baltimore, Maryland2Department of Surgery, Johns Hopkins School of Medicine, Baltimore, Maryland3Survey Research Center, University of Michigan Institute for Social Researc.
authors.forename: Lauren Hersch
authors.initials: LH
authors.lastname: Nicholas
authors.affiliation: Department of Surgery, University of Michigan Medical School, Ann Arbor5Center for Healthcare Outcomes and Policy, University of Michigan, Ann Arbor.
authors.forename: Justin B
authors.initials: JB
authors.lastname: Dimick
mesh_terms: D050110:Bariatric Surgery; D005260:Female; D006761:Hospitals / Q000592:standards*; D006801:Humans; D008297:Male; D009767:Obesity, Morbid / Q000601:surgery*; D011183:Postoperative Complications / Q000453:epidemiology*