Text and Data Mining valid from 2018-06-11
Received: 11 January 2018
Accepted: 1 June 2018
First Online: 11 June 2018
Ethics approval and consent to participate
: Ethics approval for the BASUS cohort study was obtained from the University of British Columbia’s Behavioural Research Ethics Board. All participants provided informed consent and written parental consent.
: The authors declare that they have no competing interests.
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