Text and Data Mining valid from 2019-02-02
Received: 7 December 2018
Revised: 13 January 2019
Accepted: 16 January 2019
First Online: 2 February 2019
Compliance with Ethical Standards
: The authors declared that they have no conflict of interest associated with publication of this work; no significant financial support/funding for this work has been received to influence the outcome. The manuscript is read and approved, and consent is given by all the authors. We give our permission to reproduce any material of the article.
: 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.
: Informed consent was obtained from all individual participants included in the study. This article does not contain any studies with animals performed by any of the authors.