Text and Data Mining valid from 2018-10-27
Received: 7 November 2017
Accepted: 15 October 2018
First Online: 27 October 2018
Compliance with ethical standards
: Authors declare that there is 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.
: Informed consent has been obtained from all patients.