Funding for this research was provided by:
National Institute for Health Research (RP-PG-1212-20015)
Received: 17 May 2019
Accepted: 13 June 2019
First Online: 24 June 2019
Ethics approval and consent to participate
: Study 1 received approval from North of Scotland Research Ethics Committee (17/NS/0038). Study 2 received approval from London Brent Research Ethics Committee (16/LO/0356). All participants signed informed consent form about voluntary participation in the study.
: Consent for publication is not applicable.
: The authors declare that they have no competing interests.