Text and Data Mining valid from 2018-08-08
Received: 13 February 2018
Accepted: 26 July 2018
First Online: 8 August 2018
Ethics approval and consent to participate
: Ethics approval for this study was granted by the Human Research Ethics Committee of the University of New South Wales (HREC 11024) and the Australian Institute of Health and Welfare Ethics Committee (EC 2011/1/5).The dataset supporting the conclusion was pre-collected in non-identifiable format. Therefore, informed consent was waived by the ethics committee.
: Not applicable.
: Alex Wang is a member of the editorial board (Associate Editor) of BMC Pregnancy and Childbirth.
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