“…Patients were consecutively admitted in 57 (80.28%) studies 9 , 12 , 14 – 25 , 28 , 30 – 39 , 41 – 45 , 47 – 57 , 59 , 64 , 66 , 68 , 70 – 75 , 78 – 83 . Fifty one (71.83%) studies were considered to be of high-quality 9 , 12 , 14 , 16 – 19 , 21 – 23 , 25 , 26 , 31 – 34 , 39 , 41 – 43 , 45 – 47 , 49 – 56 , 58 , 59 , 61 – 64 , 66 – 68 , 70 – 75 , 78 – 83 and six (8.45%) studies were of poor-quality 13 , 15 , 29 , 65 , 76 , 77 . The site of obstruction was clearly reported in 53 (75.7%) studies (Table 1 ).…”