Received: 30 November 2019
Accepted: 17 February 2020
First Online: 4 March 2020
Compliance with ethical standards
: The authors declare that there are no conflicts of interests regarding the content of this manuscript. No funding has been received. No financial disclosures.
: The study has obtained ethical approval by the ethical committee. All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee (TU Dresden; EK502112015) and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Informed consent of all patients has been received.