Funding for this research was provided by:
The German Health Interview and Examination Survey was funded by the Federal Ministry of Health, Germany. (Not available)
Received: 14 May 2019
Accepted: 8 January 2020
First Online: 13 January 2020
Ethics approval and consent to participate
: The DEGS study protocol was consented with the Federal and State Commissioners for Data Protection and approved by the Charité-Universitätsmedizin Berlin ethics committee in September 2008 (No. EA2/047/08). Participants provided written informed consent prior to the interview and examination.
: Not applicable.
: The authors declare that they have no competing interests.