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Thanks to Patrick Hintz (NIOSH/SRL) and Bruce Pacolay (NIOSH/HELD) for collecting the NIOSH field samples, and Sidney Soderholm (NIOSH/OD), Kevin Ashley (NIOSH/DART), and Göran Lidén (University of Stockholm) for their review.
The findings and conclusions in this report are those of the author and do not necessarily represent the views of the National Institute for Occupa- tional Safety and Health.
Column Editor Kevin Ashley
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