Received: 21 May 2020
Accepted: 22 September 2020
First Online: 1 October 2020
Ethics approval and consent to participate
: Ethical permission to undertake this work was grant by the Waltham Forest and Redbridge local research ethics committee (reference: LREC R&WF 96); the study was sponsored by Whipps Cross Hospital Research and Development Unit. All participants gave informed consent in writing for their data to be collected and used for research purposes.
: Consent, including to publish, was obtained as part of the ethical approval process.
: The authors have no conflicts or competing interests to declare.