title: Air encephalography using the McCallum automatic gas dispenser.
mesh_terms: D000388:Air; D006261:Headache / Q000209:etiology; D006801:Humans; D008722:Methods; D009325:Nausea / Q000209:etiology; D011011:Pneumoencephalography / Q000009:adverse effects / Q000295:instrumentation*; D014839:Vomiting / Q000209:etiology