Received: 29 January 2021
Accepted: 20 April 2021
First Online: 8 May 2021
: This study was approved by St Mary’s University Research Ethics Committee (SMEC_2018-19_049). All participants provided written informed consent in compliance with the Declaration of Helsinki (2013).
: Written consent for publication was attained from the individual whose data is presented in the published study.
: LH declares no competing or conflicting interests. JM is president and an indirect shareholder of Western Clinical Engineering Ltd., and has patents US 9,039,730, US 9,814,467, US 8,425,551 and US 20170112504 assigned to Western Clinical Engineering Ltd.