- Correspondence to Dr John M Dement, Division of Occupational and Environmental Medicine, Department of Community and Family Medicine, Duke University Medical Center, 2200 W. Main Street, Suite 400 Durham, NC 27705, USA;
- Received November 15, 2016
- Revised April 12, 2017
- Accepted April 21, 2017
- First published May 17, 2017.
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