“…Of these, 17 studies were included in the present review, all observational and retrospective ( Figure 1 ). Two studies only reported on PAUs [ 11 , 14 ], two studies reported on PAUs and IMHs [ 5 , 10 ] and thirteen articles only concentrated on IMHs [ 12 , 13 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 ].…”