Stark, Susanne http://orcid.org/0000-0001-6153-5998
Ewers, Michael
Funding for this research was provided by:
AOK Bundesverband (not applicable)
Article History
Received: 29 October 2018
Accepted: 5 March 2019
First Online: 21 March 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
Free to read: This content has been made available to all.