Tüttelmann, Frank
Ruckert, Christian
Röpke, Albrecht
Article History
First Online: 26 February 2018
Compliance with ethical guidelines
:
: F. Tüttelmann, C. Ruckert and A. Röpke declare that they have no competing interests.
: Approval was obtained from the Ethics Committee of the Medical Faculty in Münster. All participants gave informed written consent. The study was conducted in accordance with the Declaration of Helsinki in its most recent amended version.