Text and Data Mining valid from 2019-04-17
Received: 23 December 2016
Accepted: 20 March 2019
First Online: 17 April 2019
Compliance with ethical standards
: No conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the 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 individual participants included in the study.