Funding for this research was provided by:
Federal Ministry of Education and Research as part of the German Centre for Cardiovascular Research (81/Z540100152)
Received: 4 August 2017
Accepted: 8 January 2018
First Online: 23 January 2018
Ethics approval and consent to participate
: The ethics committee of the University Medicine Greifswald approved the study (BB 002/15a). All participants provided informed written consent prior to participation.
: All participants provided written consent that was based on study information sheet which included the statement that all scientific publications will not include personal data (e.g., name, birth date, and address).
: The authors declare that they have no competing interests.
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