Text and Data Mining valid from 2019-04-04
Received: 28 November 2018
Revised: 13 March 2019
Accepted: 26 March 2019
First Online: 4 April 2019
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: This article does not contain any studies with animals performed by any of the authors. 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. The institutional review board (IRB) approved the research methodology.
: Informed consent was obtained from all individual participants included in the study.