“…One study was a randomised controlled trial (RCT)(17) and the other 27 were retrospective observational studies. Seven studies used administrative databases (4,8,18,26,28,30,37), seven were single centre case series (29,31,32,34,(38)(39)(40), six were multicentre case series (20,(41)(42)(43)(44)(45), two used data from health insurance companies (25,27), two used data of EVAR registries (46,47) and three used a healthcare quality registry. (6,35,36)…”