title: The randomized clinical trial: beware of limitations.
authors.forename: Kuldev
authors.initials: K
authors.lastname: Singh
mesh_terms: D015982:Bias; D019317:Evidence-Based Medicine / Q000592:standards; D005901:Glaucoma / Q000453:epidemiology / Q000628:therapy; D006801:Humans; D015337:Multicenter Studies as Topic / Q000592:standards*; D009885:Ophthalmology / Q000592:standards*; D016032:Randomized Controlled Trials as Topic / Q000592:standards*