Received: 15 November 2017
Accepted: 28 May 2018
First Online: 11 June 2018
Ethics approval and consent to participate
: The ethics approval to undertake this study was provided by the Women and Newborn Health Service Human Research Ethics Committee and the Hospital Quality Improvement Committee at King Edward Memorial Hospital: Audit reference 2016166QK. The study was approved as a quality improvement audit and as this was an audit using case notes only and no interaction with patients, there was no need for patient consent.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.