Text and Data Mining valid from 2018-09-04
Received: 13 July 2018
Accepted: 27 August 2018
First Online: 4 September 2018
Compliance with ethical standards
: No conflicts of interest.
: All procedures performed 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 participants included in the study.