Funding for this research was provided by:
Bundesministerium für Bildung und Forschung (01KR1303A)
Text and Data Mining valid from 2019-03-05
Received: 11 January 2019
Accepted: 31 January 2019
First Online: 5 March 2019
Ethics approval and consent to participate
: This study approval was obtained from the independent Ethics Committee of the Medical Faculty Mannheim at Heidelberg University (Reference number: 2013–635 N-MA). The study was also approved by the ethics committee of Goethe-University and Humboldt University.
: Not applicable.
: On behalf of all the authors, the corresponding author states that he has no competing interests.
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