title: Presidential address: Controlled clinical research, opportunities and problems for the surgeon.
mesh_terms: D002986:Clinical Trials as Topic; D005069:Evaluation Studies as Topic; D013502:General Surgery; D006801:Humans; D007258:Informed Consent; D011183:Postoperative Complications; D012106:Research; D013514:Surgical Procedures, Operative; D013530:Surgical Wound Infection