The Influence of Maternal Age on Pregnancy Outcome in Nulliparous Women with Twin Gestation - Kathiresan, Anupama S.Q; Roca, Luis E, II; Istwan, Niki; Desch, Cheryl; Cordova, Yvette C; Tudela, Felipe José; Gonzalez-Quintero, Victor H (American Journal of Perinatology, 2011)