Funding for this research was provided by:
Austrian Science Fund (I 2361-1327)
Grantová Agentura České Republiky (16-34873 L)
Received: 16 January 2019
Accepted: 17 July 2019
First Online: 29 July 2019
Ethics approval and consent to participate
: The study protocol and study methodology was approved by ethic committees in Austria (Danube-University Krems; EK GZ 10/2015-2018) and the Czech Republic (Centre of Gerontology, Prague). All participants gave a written informed consent; in case of the inability to give written consent, a legal representative had to provide consent.
: Not applicable.
: The authors declare that they have no competing interests.