Carling, Christopher http://orcid.org/0000-0002-7456-3493
McCall, Alan
Harper, Damian
Bradley, Paul S.
Article History
First Online: 30 November 2018
Compliance with Ethical Standards
:
: No sources of funding were used to assist in the preparation of this letter.
: Christopher Carling, Alan McCall, Damian Harper and Paul Bradley declare that they have no conflicts of interest relevant to the content of this letter.