Text and Data Mining valid from 2019-05-17
Received: 3 April 2019
Accepted: 6 May 2019
First Online: 17 May 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: All the authors of this article declare that all procedures performed in this study, which involved human participants, were in accordance with ethical standards of institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individuals participants included in the study.