Table 4.

Demographic information about study participants.

Reference	Participants/system users	Number of participants	Severity of cognitive impairment
[27]	Mild traumatic brain injury	1	Mild/moderate
[28]	Persons with mild to moderate memory problems	9	Mild/moderate
[29]	People from Hong Kong, aged from 18 to 55, demonstrated basic attention and communication abilities, had gone through inpatient euro-rehabilitation, were medically stable	25	Mild/moderate
[30]	39-year-old female, aphasic with cognitive and memory disorders, often had difficulty with multistep tasks	1	Moderate
[31]	Workers with mild cognitive impairment	8	Mild cognitive impairment
[32]	Mild cognitive impairment patients	59	Mild cognitive impairment/dementia
[33]	Traumatic brain injury patients and self-determined complaints of memory impairment	36	Mild/moderate