“…Two included studies reported using a combination of local and national registries (Supplementary material 4 , papers 24 and 5) [ 54 , 62 ]. Only two international registries were reported being used for trial pre-screening (Supplementary material 4 , papers 15 and 11) [ 47 , 52 ]. We observed that 50% of the included studies reported pre-screening for drug trials (Supplementary material 4 , papers 22/16/15/10/21/1/14/8/7/2/6/23) (respectively [ 44 , 46 – 48 , 51 , 55 , 57 , 59 – 61 , 63 , 65 ]), and 50% of non-drug trials (Supplementary material 4 , papers 12/18/20/9//13/11/17/24/19/4/5/3) (respectively [ 42 , 43 , 45 , 49 , 50 , 52 – 54 , 56 , 58 , 62 , 64 ]).…”