- Correspondence to Dr Lauren E Griffith, Department of Clinical Epidemiology and Biostatistics, MIP 309A, McMaster University, 175 Longwood Rd. S., Hamilton, ON L8P 0A1, Canada;
- Received July 4, 2016
- Revised September 28, 2016
- Accepted September 29, 2016
- First published October 17, 2016.
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