- Correspondence to Dr Angela Paradis, Department of Epidemiology, Brown University School of Public Health, 121 South Main Street, Providence, RI 02912, USA;
- Received 11 October 2016
- Revised 17 March 2017
- Accepted 6 April 2017
- Published in print 1 September 2017.
- Published online 8 August 2017.
- Published first 10 July 2017.
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