Text and Data Mining valid from 2019-03-09
Received: 19 July 2018
Revised: 24 February 2019
Accepted: 3 March 2019
First Online: 9 March 2019
Compliance with ethical standards
: The authors declare that they have no competing interests.
: 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 present any studies with animals performed by any of the authors.
: Informed consent was obtained from all participants included in the study.