Funding for this research was provided by:
German Environment Agency/Umweltbundesamt (3714 622006)
Chemie Wirtschaftsförderungsgesellschaft mbH
Text and Data Mining valid from 2018-08-22
Received: 21 November 2017
Accepted: 15 August 2018
First Online: 22 August 2018
Compliance with ethical standards
: The authors declare that they have no conflict of interest.
: 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 consent was obtained from all individual participants included in the study.