Text and Data Mining valid from 2019-12-01
Received: 13 April 2019
Accepted: 19 December 2019
First Online: 26 December 2019
Ethics approval and consent to participate
: The study protocol was approved by the Ethics Committee of the University of Toyama. Consent to participate in the study was provided in a written format. For participants with cognitive impairment, consent was provided by their family members or proxies.
: Not applicable.
: The authors have no competing interests to declare.