Text and Data Mining valid from 2019-08-09
Received: 1 April 2019
Accepted: 30 July 2019
First Online: 9 August 2019
Ethics approval and consent to participate
: Participants were informed of the aims of the study and that their responses may be included in scientific publications. No ethical approval was sought for this research.
: Not applicable.
: The authors declare that they have no competing interests.