title: Credibility and methodology of effectiveness research keep us busy.
authors.forename: J André
authors.initials: JA
authors.lastname: Knottnerus
authors.forename: Peter
authors.initials: P
authors.lastname: Tugwell
mesh_terms: D015982:Bias; D006801:Humans; D017063:Outcome Assessment, Health Care / Q000379:methods*; D012107:Research Design; D012196:Review Literature as Topic