Received: 14 October 2019
Accepted: 12 March 2020
First Online: 30 March 2020
Ethics approval and consent to participate
: The study was conducted according to the Declaration of Helsinki. The protocol of the Turku Elderly Study was approved by the City of Turku ethical committee on health care and the Ethical Committee of the Hospital District of Southwest Finland. A written informed consent was obtained from all participants.
: The authors declare that they have no competing interests.