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Occupational Injury and Illness Surveillance: Conceptual Filters Explain Underreporting
Lenore S. Azaroff, ScD,
Charles Levenstein, PhD, MOH and
David H. Wegman, MD, MPH
The authors are with the Department of Work Environment, University of Massachusetts, Lowell.

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FIGURE 1— Simplified flowchart of events necessary to the documentation of work-related injuries and illnesses.
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Copyright © 2002 by the American Public Health Association
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