Funding for this research was provided by:
Deutsche Rentenversicherung Bund (0421 /40-64-50-61 lidA)
Text and Data Mining valid from 2020-01-10
Received: 26 March 2019
Accepted: 17 December 2019
First Online: 10 January 2020
Ethics approval and consent to participate
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Informed verbal consent was obtained from all individual participants included in the study after informing about study content, procedures and data protection in writing, according to good epidemiological practice. This procedure has been approved by the Ethics Committee of the University of Wuppertal (dated from 05/12/2008 and 20/11/2017, MS/BB 171025 Hasselhorn).
: Not applicable
: The authors declare that they have no competing interests.