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Prevention of preterm delivery in twin gestations (PREDICT): A multicentre randomised placebo-controlled trial on the effect of vaginal micronised progesterone.
Rode L, Klein K, Nicolaides K, Krampl-Bettelheim E, Tabor A.
Ultrasound Obstet Gynecol 2011;38:272-80. -
Progesterone and the risk of preterm birth among women with a short cervix.
Fonseca EB, Celik E, Parra M, Singh M, Nicolaides KH.
N Engl J Med 2007;357:462-9.