Text and Data Mining valid from 2020-02-03
Received: 19 September 2019
Accepted: 24 January 2020
First Online: 3 February 2020
Ethics approval and consent to participate
: This project has been approved by Institutional Review Board of the University of Hong Kong/Hospital Authority Hong Kong West Cluster (HKU/HA HKW IRB Reference Number: UW 19–378). This is a retrospective study and all patients included were identified anonymously.
: The authors all consent for publication.
: The authors declare that they have no competing interests.