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Article History

Received: 28 August 2019

Accepted: 14 November 2019

First Online: 27 November 2019

Ethics approval and consent to participate

: 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. The study protocol and the informed consent form was approved on 26/04/2016 by the Bioethics Committee of the Nicolaus Copernicus University in Toruń functioning at Collegium Medicum in Bydgoszcz (ref. 320/2016) which acts pursuant to the regulation of the Minister of Health and Welfare of May 11, 1999 on detailed rules for the creation, financing and functioning of bioethics committees (Dz. U. [Journal of Laws] No. 47, item 480). The study is registered in the ISRCTN registry with study ID ISRCTN17613444.Informed consent was obtained from all individual participants included in the study. All subjects gave written informed consent in accordance with the Declaration of Helsinki. If the participants with mild dementia had a legal guardian, the legal guardian gave written informed consent in accordance with the Declaration of Helsinki.This article does not contain any studies with animals performed by any of the authors.

: Not applicable.

: The authors declare that they have no competing interests.