Received: 26 December 2019
Accepted: 30 April 2020
First Online: 16 June 2020
Ethics approval and consent to participate
: This multi-centre retrospective audit was approved by the local research ethics committee (Central Adelaide Local Health Network Research Ethics Committee approval number 137). The requirement for patient consent was waived by the ethics committee given the retrospective nature of the research involving existing clinical information and the negligible risk to patients.
: Not applicable.
: The authors declare that they have no completing interests.