Article History
Received: 22 February 2018
Revised: 18 June 2018
Accepted: 12 September 2018
First Online: 2 October 2018
Compliance with ethical guidelines
:
: J. Weber, A. de Lange and A. Müller 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 1975 Helsinki declaration and its later amendments or comparable ethical standards. Informed consent was obtained from all individual participants included in the study.
: The supplement containing this article is not sponsored by industry.