“…Then, 11 full-text articles were excluded because of wrong exposure. Finally, a total of 19 articles were included in the meta-analysis [ 18 , 19 , 20 , 21 , 22 , 23 , 24 , 25 , 26 , 27 , 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 ]. A flow diagram of the literature search is shown in Figure 1 .…”