Text and Data Mining valid from 2019-03-15
Received: 28 July 2018
Accepted: 3 December 2018
First Online: 15 March 2019
Compliance with ethical standards
: No potential conflict of interest was reported by the authors.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the national research committee and with the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards.
: Informed consent was obtained from each participant included in the study.