Text and Data Mining valid from 2018-03-23
Received: 15 June 2017
Accepted: 15 March 2018
First Online: 23 March 2018
Compliance with ethical standards
: We declare that we have no conflict of interest.
: The current research project was approved by an institutional ethical panel. All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and the Declaration of Helsinki.
: All of the subjects provided written consent.