title: Directory of registries of clinical trials.
authors.affiliation: Department of Medince, John Hopkins University School of Medicine, Baltimore, Maryland 21205.
authors.forename: P J
authors.initials: PJ
authors.lastname: Easterbrook
mesh_terms: D002986:Clinical Trials as Topic; D005060:Europe; D006801:Humans; D012042:Registries; D014481:United States