“…A total of 47 studies reported economic data on the direct and indirect costs of AD for the seven selected countries; the remaining five studies reported aggregated international data [50][51][52][53][54]. Among the 47 studies, 17 primary source articles were identified in which cost component data were available and presented according to AD severity or patients' living conditions; two for France [55,56], four for Germany [7,[57][58][59], zero for Italy, three for the Netherlands [8,51,60], four for Spain [49,[61][62][63], two for the UK [64,65], and two for the USA [9,66].…”