Article History
Received: 27 March 2018
Accepted: 13 April 2018
First Online: 19 April 2018
Compliance with ethical standards
:
: All authors declare that they have no conflict of interest.
: This article does not contain any studies with animals performed by any of the authors. Research and Ethical Committee, Otto-von-Guericke University, Magdeburg, Germany proved the study. 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. Before analysis, patient data underwent a pesudonymisation.