The problem in perspective.
D000776:Anesthesiology / Q000295:instrumentation*; D006801:Humans; D009873:Operating Rooms; D011183:Postoperative Complications / Q000517:prevention & control*; D013242:Sterilization; D013530:Surgical Wound Infection / Q000517:prevention & control*; D014140:Tracheotomy / Q000009:adverse effects