Text and Data Mining valid from 2019-07-12
Received: 28 March 2019
Accepted: 29 June 2019
First Online: 12 July 2019
Compliance with ethical standards
: The 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 and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: The study was carried with a waiver of informed consent from our Institutional Review Board.