“…The duration of data collection varied from a few samples collected for a few hours in [63][64][65][66]68,[71][72][73][74][75] to 2 years in [59]. Data were collected in different types of locations, such as participants' apartments [55,60,62,68,69,74,76], seniors' living facilities [57], assisted living facilities [61], and laboratory smart homes [56,58,59,[63][64][65][66][70][71][72][73]76]. As shown in Table 7, few studies focus on collecting data in the real environment of the elderly over a long period of time.…”