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. 2020 Sep 9;10(9):e036102. doi: 10.1136/bmjopen-2019-036102

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© Author(s) (or their employer(s)) 2020. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.

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Study-specific dates, databases and their data extraction period. Data extraction time window: BC, British Columbia, Canada; BC corrections (1 January 1996–31 December 2017); DAD, discharge Abstract database (1 January 1996–30 September 2018); MSP, medical services plan (1 January 1996–30 September 2018); NACRS, national ambulatory care reporting system (1 April 2012–30 September 2018); OAT, opioid agonist treatment; PNET, PharmaNet (1 January 1996–30 September 2018); PSBC, perinatal services British Columbia (10 March 2000–14 August 2012); VS, vital statistics (1 January 1996–30 September 2018).