Text and Data Mining valid from 2018-12-17
Received: 23 November 2017
Accepted: 5 December 2018
First Online: 17 December 2018
Compliance with ethical standards
: The authors have declared 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 Declaration of Helsinki and its later amendments or comparable ethical standards. This article does not contain any studies with animals performed by any of the authors.
: Informed consent was obtained from all individual participants included in the study.