Funding for this research was provided by:
Universität zu Köln (none)
Received: 14 January 2020
Accepted: 3 February 2020
First Online: 4 March 2020
Ethics approval and consent to participate
: All patients provide written informed consent before participating in the study. The study is carried out following the ethical principles of the World Medical Association (Declaration of Helsinki), and after approval by the ethics committee of the Medical Faculty, University of Cologne (17–108) was obtained.
: All authors have given their consent for publication.
: - Prof. Fink reports personal fees (for speaking engagements) from Bayer, Lilly, Teva, Boehringer Ingelheim, Sanofi, Desitin, and Glaxo Smith Kline, outside the area of the submitted work.- Dres. Kleineberg, Richter, Becker and Weiss declare that they have no competing interests.- The study was NOT industry-sponsored.