“…The majority of the studies were conducted in Asia (37.5%) [ 7 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 ], six in the Middle East and North Africa (25.0%) [ 18 , 19 , 20 , 21 , 22 , 23 ], five in Europe [ 24 , 25 , 26 , 27 , 28 ], three in North America [ 29 , 30 , 31 ], and one in South America [ 32 ]. For the data source of the study sample, about half of the studies (54.2%) developed their risk prediction tools using retrospective population-level health data [ 7 , 11 , 12 , 15 , 16 , 17 , 18 , 22 , 25 , 26 , 28 , 29 , 31 ], while the remaining studies sampled their data from community-based health surveys [ 10 , 13 , 14 , 19 , 20 , 21 , 23 , 24 , 27 , 30 , 32 ]. The median development sample size was 2073 and ranged from 308 to 40,381.…”