“…A total of 5316 results were retrieved from the search (939 from PubMed and 4377 from EMBASE). After duplicates removal, and title and abstract screening, 130 full-texts were assessed for eligibility, and 46 studies were included for quantitative synthesis (Table 1 and Supplementary material online, Figure S1), with a total of 4 232 784 AF patients included: 3 studies were secondary analyses of randomized trials, 28,38,62 19 cohorts were based on administrative databases, 19,20,26,27,31,32,35,36,39,41,49,50,53,55,56,60,61,63,64 16 were observational multicentre studies, 21,22,24,25,33,34,37,40,42,[45][46][47][48]52,54,57 and 8 were observational single-centre studies 23,29,30,43,44,51,58,…”