von Kummer, RĂ¼diger
Article History
First Online: 31 October 2018
Compliance with ethical standards
:
: No funding was received for this study.
: The author declares he has no conflict of interest.
: All procedures performed in the 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 human participants or animals performed by the author.