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Article History

Received: 13 October 2020

Accepted: 25 February 2021

First Online: 18 March 2021

Declarations

:

: According to the CCMO, the current study did not fall within the scope of the Medical Research Involving Human Subjects Act and therefore did not have to undergo prior review by an accredited Medical Research and Ethics Committee or the CCMO. All respondents were informed about the aims of the study and its anonymous and voluntary nature, before giving their written consent to participate.The dataset funded by ZonMw was approved by the ethics committee of the Erasmus University Centre of Rotterdam in June 2011 (reference number MEC-2011-197). Prior to giving their consent, all respondents were informed about the aims of the study and its anonymous and voluntary nature, before giving their written consent to participate.

: Not applicable.

: Jane Murray Cramm is an associate editor of BMC Geriatrics. Otherwise the authors declare that they have no competing interests.