- Correspondence to Dr Andrew T Chan, Clinical and Translational Epidemiology Unit, Massachusetts General Hospital, 55 Fruit Street, Boston, MA 02114, USA;
- Received 16 November 2016
- Revised 7 February 2017
- Accepted 9 February 2017
- Published in print 16 March 2017.
- Published online 4 April 2017.
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