- Correspondence to Dr Kaori Fujishiro, Division of Surveillance, Hazard Evaluation and Field Studies, National Institute for Occupational Safety and Health (NIOSH), 4676 Columbia Pkwy (R-15), Cincinnati OH 45226, USA;
- Received November 27, 2012
- Revised April 5, 2013
- Accepted April 22, 2013
- First published May 18, 2013.
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