Article History
Received: 23 April 2018
Accepted: 23 August 2018
First Online: 12 September 2018
Compliance with ethical guidelines
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: J. Tamihardja, M. Zenk and M. Flentje declare that they have no competing interests.
: 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. Written informed consent was obtained from all patients before treatment. An additional individual consent for this analysis was not needed.