Article History
First Online: 30 July 2019
Compliance with Ethical Standards
:
: No sources of funding were used to conduct this study or prepare this manuscript.
: Lisa Alina Kneller, Francisco Abad-Santos, and Georg Hempel have no potential conflicts of interest to declare.
: 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 participants included in the study