Rickman, John M. http://orcid.org/0000-0002-1188-8805
Shackel, James
Article History
Received: 31 January 2019
Accepted: 22 May 2019
First Online: 8 June 2019
Compliance with ethical standards
:
: This study was fully approved by the ethics committee of Cranfield University.
: The authors declare that they have no conflict of interest.