Retrospective observational study of a novel smartphone app on the management of patients with mild cognitive impairment or mild dementia. - Reo Hamaguchi; Yoshihiro Hirokawa; Hirotsugu Takahashi; Tsuyoshi Hachiya; Haruna Kawano; Shuji Isotani; Emi Ito; Nobuhiro Handa; Ryozo Saito; Shigeo Horie; Hisamitsu Ide (Frontiers Digit. Health, 2023)