Text and Data Mining valid from 2020-01-07
Received: 12 May 2019
Accepted: 18 October 2019
First Online: 7 January 2020
Ethics approval and consent to participate
: This study was conducted according to the guidelines laid down in the Declaration of Helsinki and all procedures involving human subjects were approved by the Human Research Ethics Committee of the University of Newcastle (H<sup>− 2015</sup>-0199). Written and implied informed consent was obtained from all subjects.
: Not applicable.
: There are no competing interests or conflict of interest to declare by any author.