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Article History

Received: 5 February 2018

Revised: 3 July 2018

Accepted: 17 July 2018

First Online: 13 November 2018

Competing interests

: This study was supported by the Institute for Clinical Evaluative Sciences (ICES), which is funded by an annual grant from the Ontario Ministry of Health and Long-Term Care (MOHLTC). The opinions, results and conclusions reported in this paper are those of the authors and are independent from the funding sources. No endorsement by ICES or the Ontario MOHLTC is intended or should be inferred.

: The data analyzed for the current study are available upon reasonable request from the corresponding author.

: This study was approved by the Research Ethics Boards at Sunnybrook Health Sciences Centre and Women’s College Hospital. Given the retrospective nature of this study, informed consent was waived. This study was performed in accordance with the Declaration of Helsinki

: JK is the recipient of a Tier II Canada Research Chair. SAN is the recipient of a Tier I Canada Research Chair. VG is supported by the Canadian Institutes of Health Research (CIHR) Frederick Banting and Charles Best Doctoral Research Award.

: Not applicable.

: This work is published under the standard license to publish agreement. After 12 months the work will become freely available and the license terms will switch to a Creative Commons Attribution 4.0 International (CC BY 4.0).