title: Randomised trials versus observational studies: is the comparative observational study a poor compromise or a perfect synthesis?
abstract: Overview of some fundamental designs for clinical trials and studies. Some tentative definitions are given in order to stimulate questions and perspectives for further research.
authors.affiliation: Biometrie und Medizinische Dokumentation, Universität Ulm, Schwabstrasse 13, D-890785 Ulm, Germany. wilhelm.gaus@medizin.uni-ulm.de
authors.forename: W
authors.initials: W
authors.lastname: Gaus
mesh_terms: D000529:Complementary Therapies / Q000592:standards*; D019317:Evidence-Based Medicine; D006801:Humans; D019370:Observation; D016032:Randomized Controlled Trials as Topic