| http://www.w3.org/ns/prov#value | - This is due in part to the healthy worker effect???people who have jobs are usually healthier than the general population. ???Exxon???s commitment to safety and health also is a contributing factor,??? said Johnson. ???The focus of this study, which is the largest of its kind for the petroleum industry, is on educating the employee population to encourage a sense of control over health.???Johnson
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