Document is current

Article History

First Online: 18 July 2018

Compliance with Ethical Standards

:

: The authors declare that they have no conflict of interest.

: This article does not contain any studies with animals performed by any of the authors. All procedures performed in this study involving human participants were in accordance with the ethical standards of the institutional and national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards (no IRB approval by an University was necessary to conduct the study in Germany).

: Informed consent was obtained from all individual participants included in the study.