A. Ciapponi,K. Klein,D. Colaci,F. Althabe,JM Belizan,A. Deegan, AA Veroniki and ID Florez. Dexamethasone versus betamethasone for preterm birth: a systematic review and network meta-analysis. Am J Obstet Gynecol MFM. 2021;3(3):10.1016/j.ajogmf.2021.100312.