- Correspondence to Dr Jonathan N Hofmann, Occupational and Environmental Epidemiology Branch, Division of Cancer Epidemiology and Genetics, National Cancer Institute, 9609 Medical Center Drive, Room 6E604, MSC 9771 Bethesda, MD 20892;
- Received 4 May 2017
- Revised 6 October 2017
- Accepted 12 October 2017
- Published online 28 December 2017.
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