“…Finally, 33 studies were deemed eligible for data extraction and inclusion in this systematic review and meta-analysis. 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 Among these, data from 22 articles conformed to the definition of GERD in the context of the current study. 30 , 31 , 33 , 34 , 36 , 40 , 41 , 42 , 43 , 44 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 A flowchart illustrating the study selection process is shown in Fig.…”