Diederich, H.
Burkhardt, H.
Article History
Received: 12 January 2020
Accepted: 6 February 2020
First Online: 27 February 2020
Compliance with ethical guidelines
:
: H. Diederich and H. Burkhardt declare that they have no competing interests.
: All procedures performed in studies involving human participants or on human tissue were in accordance with the ethical standards of the institutional and/or national research committee and with the 1975 Helsinki declaration and its later amendments or comparable ethical standards. Informed consent was obtained from all individual participants included in the study.