title: Commentary: multilevel endpoints and the problems of theoretical aggregation and overlapping.
authors.forename: Grazyna Teresa
authors.initials: GT
authors.lastname: Adamiak
mesh_terms: D002986:Clinical Trials as Topic / Q000379:methods*; D003627:Data Interpretation, Statistical; D006801:Humans; D015233:Models, Statistical; D017063:Outcome Assessment, Health Care / Q000379:methods*; D011788:Quality of Life