- 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 August 24, 2017
- Revised October 10, 2017
- Accepted October 27, 2017
- First published November 9, 2017.
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