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Harber Philip M.D. M.P.H.
Journal of Occupational Medicine: July 1984
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Medical certification for respirator use should be based on understanding of their respiratory, cardiac, mechanical, psychological, and other effects. Work environmental factors (e.g., level of hazard and work load of the job), respirator characteristics, and personal characteristics of the worker should determine the evaluative procedures used; a three-level scheme is suggested.

©1984 The American College of Occupational and Environmental Medicine