Article History
Received: 28 November 2018
Accepted: 11 February 2019
First Online: 25 February 2019
Compliance with ethical standards
:
: The authors did not receive funding for this research and declare that they have no competing interests.
: This study and all procedures were in approved by Newcastle University Faculty of Medical Sciences Ethics Committee.
: All participants were informed of the purpose of the study and provided consent.