Ploeger, M. M.
Jacobs, C.
Gathen, M.
Kaup, E.
Randau, T. M.
Friedrich, M. J.
Hischebeth, G. T.
Wimmer, M. D.
Article History
Received: 1 January 2018
First Online: 11 June 2018
Compliance with ethical standards
:
: The study was approved by the institutional review board of the University of Bonn, Bonn, Germany, Faculty of Medicine (IRB # 200/16).
: The author(s) declare that they have no competing interests.