Association between visitation restriction during the COVID-19 pandemic and delirium incidence among emergency admission patients: a single-center retrospective observational cohort study in Japan. - Kandori, Kenji; Okada, Yohei; Ishii, Wataru; Narumiya, Hiromichi; Maebayashi, Yoshiro; Iizuka, Ryoji (Journal of Intensive Care, 2020)