- Correspondence to Dr Martha J Shrubsole, Division of Epidemiology, Department of Medicine, Vanderbilt University Medical Center, 2525 West End Avenue Room 837-A, Nashville, TN 37203, USA;
- Received August 18, 2016
- Revised October 26, 2016
- Accepted October 27, 2016
- First published November 15, 2016.
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