Global protection.
Koppel
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W
MEDEX Assistance Corporation, Timonium, Md., USA.
Tarrant
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P
D016902:Air Pollution, Indoor / Q000009:adverse effects / Q000517:prevention & control; D002487:Centers for Disease Control and Prevention, U.S.; D004781:Environmental Exposure / Q000009:adverse effects / Q000517:prevention & control*; D019550:Environmental Medicine / Q000379:methods; D004784:Environmental Monitoring / Q000379:methods; D006293:Health Promotion / Q000458:organization & administration*; D006801:Humans; D014195:Travel; D014481:United States