Erratum to: A Double-Blind, Randomized, Placebo-Controlled Trial of 17 Alpha-hydroxyprogesterone Caproate in the Management of Preterm Premature Rupture of Membranes - Langen, Elizabeth S.; Sit, Anita; Sherwin, Katie; Lyell, Deirdre J.; Blumenfeld, Yair J.; El-Sayed, Yasser Y. (American Journal of Perinatology, 2018)