“…States [23,24,3,[25][26][27][28][29][30][31][32][33][34], seven in Europe [13,[35][36][37][38][39][40], t wo in Australia [41], one each fro m Canada [42], Singapore 3 [43] and Taiwan [44], and two in middle -or low-inco me regions [40,45]. Overall, twenty studies used a prevalence 4 approach [23, 24, 3, 25-28, 13, 35, 30, 31, 41, 37, 38, 45, 39, 46, 40, 32, 43], seven used an incidence approach [36, 5 29, 44, 42, 33, 34, 27], and only one used an economic model to estimate the lifet ime costs of mult imorb idity [36].…”