- Correspondence to Dr Gabriel Shapiro, Department of Epidemiology, Biostatistics and Occupational Health, McGill University, Purvis Hall, 1020 Pine Ave West, Room 16A, Montreal, Quebec, Canada H3A 1A2;
- Received October 28, 2015
- Revised May 27, 2016
- Accepted June 10, 2016
- First published June 24, 2016.
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