title: Letter: asthma mortality associated with pneumothorax and intermittent positive-pressure breathing.
mesh_terms: D001249:Asthma / Q000150:complications / Q000401:mortality* / Q000628:therapy; D003645:Death, Sudden; D006801:Humans; D011030:Pneumothorax / Q000150:complications* / Q000209:etiology; D011175:Positive-Pressure Respiration / Q000009:adverse effects*