What is a health care trial?
D002170:Canada; D002986:Clinical Trials as Topic; D003695:Delivery of Health Care; D004035:Diet Therapy; D004358:Drug Therapy; D006801:Humans; D008722:Methods; D010380:Peer Review; D010919:Placebos; D012106:Research; D013514:Surgical Procedures, Operative; D013812:Therapeutics; D014481:United States
D010919:Placebos