RESULTS
We identified 765 records after removing duplicates, and we finally included 45 RCTs12-14, 35-76 involving 11,227 women and 11,878 infants (Figure 1 ). Thirteen RCTs compared dexamethasone vs. betamethasone (2,903 women and 3,170 infants) and 32 compared corticosteroids vs. placebo/no treatment (8,324 women and 8,708 infants). In addition to the 12 trials28,29,31,32,39,44,47,48,54,56,59,62included by Brownfoot 20139 and the 3021-27,30,33-38,40-43,45,46,49-53,55,57,58,60,61included by Roberts 201710, we included three additional ones12-14 (1,896 women and 2,059 infants) and we identified four ongoing trials6,77-79.