“…After a detailed evaluation of these articles, 80 studies remained for assessment. After applying the selection criteria, 36 cohort studies involving 4326 patients were identified and included in the meta-analysis ( 14 , 15 , 16 , 17 , 18 , 19 , 20 , 21 , 22 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 ). In these 36 studies, 2656 patients were included in 12 studies ( 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 ) with treatments prior to 1990 and long-term follow-up.…”