Clinical trials. Controlled or double blind?
D000959:Antihypertensive Agents / Q000627:therapeutic use; D002986:Clinical Trials as Topic; D004311:Double-Blind Method; D006801:Humans; D006993:Hypnotics and Sedatives / Q000627:therapeutic use; D012107:Research Design
D000959:Antihypertensive Agents; D006993:Hypnotics and Sedatives