Ethics of investigation.
D002758:Cholangiography; D002986:Clinical Trials as Topic; D003933:Diagnosis; D004724:Endoscopy; D028744:Ethics Committees, Research; D004992:Ethics, Medical; D006761:Hospitals; D006801:Humans; D008485:Medical Audit; D012306:Risk; D018570:Risk Assessment; D036302:Therapeutic Human Experimentation; D006113:United Kingdom