The cost of scavenging--is it worth it?
D000389:Air Conditioning / Q000295:instrumentation; D000397:Air Pollution / Q000517:prevention & control*; D000776:Anesthesiology / Q000295:instrumentation*; D000777:Anesthetics / Q000009:adverse effects; D004467:Economics; D006801:Humans; D014691:Ventilation
D000777:Anesthetics