Text and Data Mining valid from 2018-12-08
Received: 1 October 2018
Accepted: 20 November 2018
First Online: 8 December 2018
Compliance with ethical standards
: 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. Informed consent was obtained from all individuals included in the study.
: The authors declare that they have no conflict of interest.