Robot-Delivered Cognitive Stimulation Games for Older Adults: Usability and Acceptability Evaluation. - Norina Gasteiger; Ho Seok Ahn; Chiara Gasteiger; Christopher Lee; Jongyoon Lim; Christine Fok; Bruce A. MacDonald; Geon Ha Kim; Elizabeth Broadbent (ACM Trans. Hum. Robot Interact., 2021)