Text and Data Mining valid from 2017-06-19
Received: 19 October 2015
Accepted: 12 June 2017
First Online: 19 June 2017
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 individual participants included in the study.