Schäfer, Ingmar
Hansen, Heike http://orcid.org/0000-0003-4901-3091
Ruppel, Thomas
Lühmann, Dagmar
Wagner, Hans-Otto
Kazek, Agata
Scherer, Martin
Funding for this research was provided by:
Association of Statutory Health Insurance Physicians Hamburg and Schleswig-Holstein
Article History
Received: 15 October 2019
Accepted: 23 January 2020
First Online: 31 January 2020
Ethics approval and consent to participate
: The study was approved by the Ethics Commission of the Hamburg Medical Association on 12 August 2013 (file number PV 4535). All study participants gave their written informed consent prior to their participation in the study.
: All participants gave their written consent to publish their names in the ‘Acknowledgements’ section.
: The authors declare that they have no competing interests.