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Estimates from national unintentional, non-fire-related CO poisoning surveillance in the United States
aSource: National Vital Statistics System
bSource: Healthcare Cost and Utilization Project Nationwide Inpatient Sample
cSource: Hyperbaric oxygen treatment facility data
dSource: Healthcare Cost and Utilization Project Nationwide Emergency Department Sample
eSource: National Poison Data System
fSource: National Health Interview Survey 2009
CO = carbon monoxide
