title: ClinicalTrials.gov: what the numbers don't tell us.
authors.affiliation: 1 Division of Lung Diseases National Heart, Lung, and Blood Institute Bethesda, Maryland.
authors.forename: Gail G
authors.initials: GG
authors.lastname: Weinmann
authors.forename: James P
authors.initials: JP
authors.lastname: Kiley
mesh_terms: D002986:Clinical Trials as Topic; D003422:Critical Care; D016208:Databases, Factual; D006801:Humans; D015272:Pulmonary Medicine; D012042:Registries; D056508:Sleep Medicine Specialty