Text and Data Mining valid from 2019-04-27
Received: 19 December 2018
Accepted: 12 April 2019
First Online: 27 April 2019
Compliance with ethical standards
: On behalf of all authors, I declare no conflict of interest.
: All procedures performed in this study involving human participants were in accordance with the ethical standards of the institutional and national research committee and with the 1964 Helsinki Declaration. Procedures performed in this study did not involve animals.
: Informed consent was obtained from all individual participants included in the study.