Editorial: Illness in the clouds.
D000337:Aerospace Medicine; D000368:Aged; D002318:Cardiovascular Diseases / Q000453:epidemiology; D004630:Emergencies; D005392:First Aid; D006801:Humans; D000860:Hypoxia / Q000453:epidemiology; D008875:Middle Aged; D009026:Mortality; D014195:Travel