“…Full manuscripts were evaluated in 11 of 27 studies that were included in the review [1] , [6] , [7] , [8] , [9] , [10] , [11] , [12] , [13] , [14] , [15] . All included studies were observational cohort studies, with no randomisation or control groups, apart from in relation to the materials used for embolisation and reported on IBH.…”