Text and Data Mining valid from 2020-01-28
Received: 29 August 2019
Accepted: 13 November 2019
First Online: 28 January 2020
Ethics approval and consent to participate
: Ethical approval for the study protocol was obtained from the Institutional Research Ethics Board, and the requirement for informed consent was waived.
: Waived by the Institutional Research Ethics Board
: The authors declare that they have no competing interests.