Natural gas, unnatural causes.
D000293:Adolescent; D000328:Adult; D002249:Carbon Monoxide Poisoning / Q000175:diagnosis*; D002648:Child; D002675:Child, Preschool; D003937:Diagnosis, Differential; D005260:Female; D005579:Fossil Fuels; D006361:Heating; D006801:Humans; D006985:Hyperventilation / Q000175:diagnosis / Q000209:etiology; D007251:Influenza, Human / Q000175:diagnosis; D008297:Male
D005579:Fossil Fuels