Funding for this research was provided by:
Received: 30 September 2020
Accepted: 10 March 2021
First Online: 22 March 2021
: The trend study was approved by the ethics committee of the University of Freiburg (Az. 294/12_140826). By returning the questionnaire, the respondents gave their consent to participate in the study.
: The data of this study are anonymized. It is not possible to identify individual persons. Consent for publication was not necessary.
: AS declares involvement in former studies on Gesundes Kinzigtal GmbH (2006–2015), an employment at Gesundes Kinzigtal GmbH (1 June 2015 until 31 December 2015), and a current involvement in the INTEGRAL study on Gesundes Kinzigtal which is funded by the Innovation Committee of the Joint Federal Committee in Germany (after peer review by the scientific advisory board), grant number 01VSF16002. ATE, PM and MAR declare no conflicts of interest.