Received: 31 January 2020
Accepted: 1 June 2020
First Online: 16 June 2020
Ethics approval and consent to participate
: This study received ethical approval by the West of Scotland NHS and Queen Margaret University Research Ethics Committees (NHS REC reference number: 11/WS/0001). Written informed consent was obtained from each participant.
: Not applicable.
: The authors declare that they have no competing interests.