The need for Diagnosis-Related Group 471. Protection for clinical research.
D002986:Clinical Trials as Topic / Q000191:economics*; D003365:Costs and Cost Analysis; D003953:Diagnosis-Related Groups; D007350:Insurance, Hospitalization / Q000191:economics; D012051:Reimbursement Mechanisms; D012109:Research Support as Topic / Q000191:economics*; D014481:United States