Text and Data Mining valid from 2019-11-28
Received: 7 June 2019
Accepted: 16 November 2019
First Online: 28 November 2019
Ethics approval and consent to participate
: The KIGGS study was approved by the Charité/Universitätsmedizin Berlin ethics committee and the Federal Office for the Protection of Data.
: Informed consent was obtained by the KIGGS study group from all individual participants included in the study.
: Not applicable.
: The authors declare that they have no competing interests.