Text and Data Mining valid from 2019-03-11
Received: 7 March 2018
Accepted: 1 March 2019
First Online: 11 March 2019
Compliance with ethical standards
: The corresponding author states that there is no conflict of interest.
: All procedures performed in studies involving human participants were 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. LJMU Research Ethics Committee provided approval for the research (ref: 15/NSP/018).
: Informed consent was obtained from all individual participants included in the study.