Funding for this research was provided by:
Bundesministerium für Bildung und Forschung (016Y1113A, 016Y1113B)
Received: 26 June 2017
Accepted: 13 February 2018
First Online: 28 February 2018
Ethics approval and consent to participate
: This study was conducted according to the Declaration of Helsinki and Good Clinical Practice guidelines. The protocol of the study data used in the graphical models received approval from the research ethics committee of the Medical Faculty of the Ludwig-Maximilians-University Munich (ID: 530–12), and the protocol of the group discussions with nursing home residents gained approval from the ethics committee of the German Society of Nursing Science (DGP) (ID: 15–002). Written informed consent was obtained from participants of both studies. The trial was registered in the German clinical trials register, reference number DRKS00010037, registration date 12 February 2016.
: Not applicable.
: All authors declare that they have no competing interests. GM is a member of the BMC Geriatrics editorial board, but was not involved in the review process.
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