Wutzler, A.
Kloppe, C.
Bilgard, A. K.
Mügge, A.
Hanefeld, C.
Article History
Received: 28 June 2017
Revised: 31 August 2017
Accepted: 4 October 2017
First Online: 7 November 2017
Compliance with ethical guidelines
:
: A. Wutzler, C. Kloppe, A.K. Bilgard, A. Mügge and C. Hanefeld declare that they have no competing interests.
: The study was approved by the institutional review board of the Ruhr University Bochum (17-6023-BR) and complies with the Declaration of Helsinki.