Funding for this research was provided by:
Canadian Institutes of Health Research
British Columbia Lung Association
Received: 23 April 2018
Accepted: 25 June 2018
First Online: 27 July 2018
: JML is the guarantor of the manuscript, had full access to all of the data in the study, and takes responsibility for the integrity of the data and the accuracy of the data analysis.
: All subjects provided written informed consent under the University of British Columbia (UBC)-approved Providence Health Care ethics protocol H14–03267. As no individual data are presented, consent for publication is not applicable.
: The authors declare that they have no competing interests.
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