Article History
Received: 18 May 2018
Revised: 28 June 2018
Accepted: 11 July 2018
First Online: 30 July 2018
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: The study was conducted in agreement with the Declaration of Helsinki. The study (registration number 180_16B) was approved by the Ethical Committee of the Medical Faculty, Friedrich-Alexander Universität Erlangen-Nürnberg. Informed consent was obtained from all subjects participating in the study.