Funding for this research was provided by:
Bundesanstalt für Arbeitsschutz und Arbeitsmedizin (project no. F2384, project no. F2250)
Received: 19 June 2019
Accepted: 15 November 2019
First Online: 28 November 2019
Compliance with ethical standards
: No potential conflict of interest was reported by the authors.
: The S-MGA study has been approved by the ethics commission of the Federal Institute of Occupational Safety and Health, approval number 006_2016_Müller. All employees in the sample were contacted by mail and the interviews were only conducted after each respondent gave their informed oral consent (Rose et al. 2017). A written consent was given for the willingness to participate at follow-up.