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Article History

Received: 9 September 2019

Accepted: 7 November 2019

First Online: 3 January 2020

Compliance with ethical standards

:

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

: Informed consent was obtained from all individual participants included in the study before treatment. According to the statement of Research and Ethical Committee, Otto-von-Guericke University, Magdeburg, Germany, an additional individual consent was not required for this analysis.

: This article does not contain any studies with animals performed by any of the authors. 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.