title: A primer on MedisGroups.
authors.forename: L I
authors.initials: LI
authors.lastname: Iezzoni
mesh_terms: D003625:Data Collection / Q000379:methods; D003628:Database Management Systems; D006801:Humans; D009017:Morbidity; D010043:Outcome and Process Assessment, Health Care; D010414:Pennsylvania; D011785:Quality Assurance, Health Care; D012720:Severity of Illness Index; D012984:Software