- Correspondence to Mia van der Kop, Epidemiologist, University of British Columbia Centre for Disease Control, Doctoral student, Department of Public Health Sciences, Karolinska Institutet, 655 12th Avenue West, Vancouver, British Columbia, Canada V57 4R4;
- Received June 2, 2014
- Revised June 3, 2014
- Accepted June 4, 2014
- First published August 4, 2014.
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