Christoph, Frank http://orcid.org/0000-0002-3960-4886
Herrmann, Franziska
Werthemann, Peter
Janik, Thomas
Schostak, Martin
Klopf, Christian
Weikert, Steffen
Article History
Received: 2 August 2018
Accepted: 25 September 2019
First Online: 24 October 2019
Ethics approval and consent to participate
: Ethical approval to conduct the clinical study was obtained from the institutional review board (Ethical Committee of the Ă„rztekammer Berlin), approval number EA1/134/14, before the study was initiated and was in accordance with the ethical standards laid down in the Declaration of Helsinki.
: Not applicable.
: The authors declare that they have no competing interests.