title: What are the four phases of clinical research trials?
authors.affiliation: Centre for Medical and Healthcare Education, St George's, University of London, London, UK p.sedgwick@sgul.ac.uk.
authors.forename: Philip
authors.initials: P
authors.lastname: Sedgwick
mesh_terms: D035843:Biomedical Research / Q000458:organization & administration*; D002492:Central Nervous System Depressants / Q000627:therapeutic use*; D002648:Child; D002986:Clinical Trials as Topic / Q000379:methods*; D006801:Humans; D008550:Melatonin / Q000627:therapeutic use*; D012893:Sleep Wake Disorders / Q000188:drug therapy*
chemical_list: D002492:Central Nervous System Depressants; D008550:Melatonin