Funding for this research was provided by:
Text and Data Mining valid from 2019-01-28
Received: 29 August 2018
Accepted: 10 January 2019
First Online: 28 January 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: Ethics committee approval was obtained prior to study commencement.
: Informed consent was obtained from all individual participants included in the study.