Funding for this research was provided by:
Text and Data Mining valid from 2018-11-26
Received: 2 July 2018
Accepted: 7 November 2018
First Online: 26 November 2018
Compliance with ethical standards
: The funding organization played no role in the study design; in the collection, analysis, and interpretation of data; in the writing of the report; or in the decision to submit the report for publication.
: 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. This article does not contain any studies with animals performed by any of the authors.
: Informed consent was obtained from all individual participants included in the study.
: The datasets generated and analysed during the current study are available from the corresponding author on reasonable request.