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Continued increase in prevalence of r-type opacities among underground coal miners in the USA
- Correspondence to Dr Noemi B Hall, Respiratory Health Division, National Institute of Occupational Safety and Health, Morgantown, WV 26505–2888, USA; nhall{at}cdc.gov
Citation
Continued increase in prevalence of r-type opacities among underground coal miners in the USA
Publication history
- Received January 3, 2019
- Revised April 8, 2019
- Accepted April 14, 2019
- First published April 25, 2019.
Online issue publication
June 13, 2019
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- Previous version (13 June 2019).
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© Author(s) (or their employer(s)) 2019. No commercial re-use. See rights and permissions. Published by BMJ.