Niemier, K.
Seipelt, D.
Geipel, E.
Article History
First Online: 28 February 2018
Compliance with ethical guidelines
:
: K. Niemier, D. Seipelt and E. Geipel declare that they have no competing interests.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Informed consent was obtained from all individual participants included in the study.