Article History
Received: 13 March 2019
Accepted: 14 August 2019
First Online: 20 August 2019
Ethics approval and consent to participate
: This study was carried according to the Declaration of Helsinki and the Guideline for Good Clinical Practice. The experiment was approved by local ethics committee of the University of Leipzig (199-13-15072013). All participants signed an informed consent.
: Not applicable.
: MS is a speaker for Lilly, Medice Arzneimittel and Servier. JH and CU have reported no further competing interests.