title: Common problems in clinical trials.
mesh_terms: D002986:Clinical Trials as Topic; D004358:Drug Therapy / Q000592:standards*; D005069:Evaluation Studies as Topic; D006805:Human Experimentation; D008433:Mathematics; D008722:Methods; D004364:Pharmaceutical Preparations / Q000592:standards; D012106:Research
chemical_list: D004364:Pharmaceutical Preparations