Footnotes

• Contributors All authors contributed to the study concept and design. RT was responsible for the acquisition, analysis and interpretation of data. The manuscript was drafted by RT and critically reviewed by SR and CM. All authors had full access to all the data in the study and take responsibility for the integrity of the data and accuracy of data analysis.

• Competing interests None declared.

• Ethics approval The survey was reviewed and approved by the hospital's Quality Improvement Committee as having met the ‘Australian National Health and Medical Research Council requirements for quality assurance and audit projects’.

• Data sharing statement Further details can be obtained from the corresponding author on request.