“…Most of the studies (n = 35) [2,4,12,13,[16][17][18][19][20][21][22][23][24][25]27,[30][31][32][33][35][36][37][38][40][41][42][44][45][46][47][48][49][50][51][52] were observational and retrospective. We extracted data from eleven (n = 11) English abstracts provided for Chinese articles [17,26,30,32,34,35,37,38,42,44,48] and for one (n = 1) commentary [19].…”