Graef, Frank http://orcid.org/0000-0002-0435-9059
Falk, R.
Tsitsilonis, S.
Perka, C.
Zahn, R. K.
Hommel, H.
Article History
Received: 6 August 2019
Accepted: 19 November 2019
First Online: 27 November 2019
Compliance with ethical standards
:
: All authors declare that they have no conflict of interest.
: This study was performed without external funding.
: This study was carried out according to the laws and ethical standards of the local legal representative body and was approved by the local ethics committee of the Brandenburg state of Germany (approval number AS17(bB)/2015).