Willms, A.
Schaaf, S.
Schwab, R.
Richardsen, I.
Jänig, C.
Bieler, D.
Wagner, B.
Güsgen, C.
Article History
Received: 15 December 2016
Accepted: 8 March 2017
First Online: 5 April 2017
Compliance with ethical standards
:
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
: The authors declare that they have no conflict of interest.
: No funding was received for this work.The data reported here contain results of a yet unpublished doctoral thesis.
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