- Correspondence to Sarah J Locke, Occupational and Environmental Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, 9609 Medical Center Drive, Rm 6E550, MS 9771, Bethesda, MD 20892, USA;
- Received August 15, 2013
- Revised February 25, 2014
- Accepted March 6, 2014
- First published March 28, 2014.
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