“…Twenty-two studies [ 21 , 23 , 26–28 , 30 , 31 , 33 , 34 , 36–44 , 46–49 ] were from Asia, ten studies [ 16 , 17 , 20 , 22 , 25 , 29 , 32 , 35 , 45 , 50 ] were from Europe, and the rest [ 18 , 19 , 24 , 36 ] were from other regions. Among these studies, eleven studies [ 16–20 , 24 , 26 , 30 , 38 , 42 , 45 ] reported the location of PE, three studies [ 19 , 39 , 45 ] mentioned the size of PE, and five studies [ 20 , 23 , 32 , 35 , 42 ] provided data on mortality in AP patients with or without PE. Additionally, PE was detected by chest X-ray in eight studies [ 16 , 18 , 20 , 22–24 , 41 , 50 ], by CT in 14 studies [ 19 , 21 , 25–27 , 30 , 32 , 35 , 38 , 39 , 42 , 45–47 ], by transthoracic sonography in one study [ 17 ] and by combination of above methods in four studies [ 29 , 31 , 48 , 49 ].…”