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Letters to the Editor: PDF Only

Drug Use

Association vs Causation

Ryan, James MD, MPH; Zwerling, Craig MD, PhD, MPH; Jones, Michael PhD

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East Boston Logan Health Associates Logan International Airport East Boston, Massachusetts

Journal of Occupational Medicine: October 1993 - Volume 35 - Issue 10 - p 984-992
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©1993 The American College of Occupational and Environmental Medicine