Article History
Received: 30 April 2019
Revised: 26 August 2019
Accepted: 28 August 2019
First Online: 5 September 2019
Compliance with ethical standards
:
: Elisabeth Grau claims she has no conflict of interest. Folkert Horn claims he has no conflict of interest. Uwe Nixdorff claims he has no conflict of interest. Georg Michelson is the owner of the Talkingeyes&More GmbH, Erlangen, Germany.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the Universitätsklinikum Erlangen 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.