Advances and retreats.
D002318:Cardiovascular Diseases; D013504:Cardiovascular Surgical Procedures / Q000145:classification / Q000379:methods; D002985:Clinical Protocols; D007722:Health Knowledge, Attitudes, Practice; D006801:Humans; D018156:Journalism, Medical / Q000592:standards*; D011786:Quality Control; D016032:Randomized Controlled Trials as Topic / Q000145:classification; D015203:Reproducibility of Results; D012106:Research / Q000145:classification / Q000592:standards; D012107:Research Design