Groves, Christopher P.
Butland, Barbara K.
Atkinson, Richard W.
Delaney, Anthony P.
Pilcher, David V.
Article History
Received: 17 February 2020
Accepted: 10 April 2020
First Online: 30 April 2020
Compliance with ethical standards
:
: Ms Butland owns shares in Royal Dutch Shell and Scottish and Southern Energy, and her spouse has a deferred Shell pension. All other authors declare no conflicts of interest.