title: Limitations of clinical trials in surgery.
authors.forename: Grzegorz
authors.initials: G
authors.lastname: Wallner
authors.forename: Marek
authors.initials: M
authors.lastname: Majewski
authors.forename: Witold
authors.initials: W
authors.lastname: Zgodziński
mesh_terms: D002986:Clinical Trials as Topic / Q000592:standards / Q000639:trends*; D019317:Evidence-Based Medicine / Q000379:methods / Q000639:trends*; D011044:Poland; D010818:Practice Patterns, Physicians' / Q000592:standards; D013043:Specialties, Surgical / Q000379:methods / Q000639:trends*