Funding for this research was provided by:
Transport Accident Commission (T008)
Received: 18 August 2019
Revised: 7 November 2019
Accepted: 22 November 2019
First Online: 11 December 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: We certify that all applicable institutional and governmental regulations were followed during the course of this research.