title: Study types and study issues in clinical medicine.
authors.affiliation: Center for Clinical Studies, University Hospital Regensburg, D-93042 Regensburg, Germany. michael.koller@klinik.uni-regensburg.de
authors.forename: Michael
authors.initials: M
authors.lastname: Koller
authors.forename: Wilfried
authors.initials: W
authors.lastname: Lorenz
mesh_terms: D035843:Biomedical Research / Q000379:methods*; D002986:Clinical Trials as Topic / Q000379:methods*; D019317:Evidence-Based Medicine; D017408:Guidelines as Topic; D006801:Humans