Text and Data Mining valid from 2018-09-15
Received: 2 July 2018
Accepted: 5 September 2018
First Online: 15 September 2018
Compliance with ethical standards
: All authors declare that they have no conflicts of interest or some affiliations with any organization or entity with financial or non-financial interest in the subjects discussed in this work.
: All procedures performed in our study involving human participants were in accordance with the ethical standards of the institutional and national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
: Signed informed consent was obtained from all the individual participants included in this study.