Received: 21 December 2019
Accepted: 6 May 2020
First Online: 14 May 2020
Ethics approval and consent to participate
: The study was a secondary analysis of publicly available anonymised data; therefore, no formal ethical clearance was required.
: Not applicable. Our manuscript does not contain individual person’s data in any form such as individual details, images or videos.
: The authors declare that they have no competing interests.