- Correspondence to Dr Wei Zheng, Division of Epidemiology, Department of Medicine, Vanderbilt-Ingram Cancer Center, Vanderbilt Epidemiology Center, Vanderbilt University School of Medicine, Nashville, Tennessee, 37203, USA;
- Received 24 August 2017
- Revised 10 October 2017
- Accepted 27 October 2017
- Published online 9 November 2017.
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