Employers' and purchasers' roles in smoking cessation.
Whitehead
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Preventive Health Services, Chevron Corporation, San Francisco, California 94105, USA.
D004651:Employment; D017408:Guidelines as Topic; D006279:Health Maintenance Organizations; D006282:Health Personnel; D006293:Health Promotion; D006801:Humans; D012907:Smoking / Q000191:economics; D016540:Smoking Cessation; D000074606:Smoking Prevention