Received: 6 September 2019
Accepted: 29 March 2020
First Online: 20 April 2020
Ethics approval and consent to participate
: This study was approved by the Discover Data Access Group (DRAG): no reference numbers are given by this committee.
: Not applicable.
: AB and PA are co-directors of the Dr. Foster Unit at Imperial, which is part-funded by Dr. Foster, a Telstra Health healthcare information company.