Funding for this research was provided by:
University of Liverpool
Text and Data Mining valid from 2019-03-30
Received: 31 October 2018
Accepted: 1 March 2019
First Online: 30 March 2019
Compliance with Ethical Standards
: All the data referred to has been anonymised in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
: Informed consent was not applicable.
: The authors declare that they have no conflict of interest.