
Design and setting

This study was a randomized, assessor‐blind, parallel‐design, two‐arm, phase II trial, conducted at the Tokyo Metropolitan Institute of Gerontology (TMIG) and in participants' homes nearby. The institutional review board of TMIG reviewed/approved the study protocol. Written informed consent was obtained before the baseline assessment, and patient anonymity was preserved. The protocol was registered in the University Hospital Medical Information Network Clinical Trial Registry on October 12, 2020 (no. UMIN000042083). This study is compliant with the relevant CONSORT 2010 guidelines.