Text and Data Mining valid from 2017-04-27
Received: 24 October 2016
Accepted: 14 April 2017
First Online: 27 April 2017
Compliance with Ethical Standards
: All authors declare that there are no potential conflicts 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.
: This article does not contain any studies with animals performed by any of the authors.
: Informed consent was obtained from all individual participants included in the study.