Text and Data Mining valid from 2019-10-25
Received: 8 July 2019
Revised: 16 October 2019
Accepted: 17 October 2019
First Online: 25 October 2019
Compliance with ethical standards
: All authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional 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 study participants.