title: [Multi-levels, fewer differences. Possibly misleading picture based on current analysis of hospitals' results].
authors.affiliation: Institutet för miljömedicin, Karolinska institutet, Stockholm. anders.ahlbom@imm.ki.se
authors.forename: Anders
authors.initials: A
authors.lastname: Ahlbom
authors.forename: Lars
authors.initials: L
authors.lastname: Alfredsson
authors.forename: Tomas
authors.initials: T
authors.lastname: Andersson
authors.forename: Johan
authors.initials: J
authors.lastname: Hallqvist
authors.forename: Ulf
authors.initials: U
authors.lastname: Strömberg
mesh_terms: D017052:Hospital Mortality; D006761:Hospitals / Q000592:standards*; D006801:Humans; D016015:Logistic Models; D015233:Models, Statistical; D009203:Myocardial Infarction / Q000401:mortality; D016896:Treatment Outcome