“…[17], [62], [57], [45], [30] [47], [16], [17], [30] Observational / survey 7 [33], [23], [46], [26], [34], [56], [29] Published Protocol 6 [10], [13], [19], [18], [35], [40] Review article (non-systematic) 6 [15], [53], [22], [50], [49], [38] Review article (systematic) 3 [39], [43], [48] Forty-one studies explicitly described the study population under investigation, with 37 studies focused on older adults alone. Fourteen of these studies specified a specific age range to define older adults with the starting age for this category varying from 55 to 65.…”