External monitoring in multiclinic trials: applications from ophthalmologic studies.
D002986:Clinical Trials as Topic; D005069:Evaluation Studies as Topic / Q000379:methods* / Q000592:standards; D005128:Eye Diseases / Q000628:therapy*; D006801:Humans; D009934:Organization and Administration; D011786:Quality Control; D014787:Vision Tests / Q000379:methods / Q000592:standards*