- Correspondence to Catherine C Lerro, Occupational and Environmental Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, 9609 Medical Center Drive, 6E624, MSC 7991, Bethesda, MD 20892-7991, USA;
- Received 30 December 2014
- Revised 5 May 2015
- Accepted 22 June 2015
- Published online 6 July 2015.
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