“…Regarding study design, three studies [ 15 , 19 , 20 ] employed a cross-sectional design; four cohort studies [ [16] , [17] , [18] , 27 ] and two RCT studies [ 21 , 22 ]. Furthermore, concerning the study population, 7 studies [ [28] , [29] , [30] , [31] , [32] , [33] ] were conducted only on parturients [ [15] , [16] , [17] , [18] , 20 , 21 , 27 , 34 ] whereas the remaining two were done on all patients from whose we extracted data of cesarean section [ 19 , 22 ] ( Table 1 ).…”