Funding for this research was provided by:
Provincial Laboratory for Public Health (Not applicable)
Received: 24 September 2018
Accepted: 7 February 2019
First Online: 19 February 2019
Ethics approval and consent to participate
: This study was approved by the University of Alberta Biomedical Health Research Ethics Board. The board waived the need of participant consent because samples were anonymized (study ID Pro00037093).
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.