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Cervical length at mid-pregnancy and the risk of primary cesarean delivery.
Smith GC, Celik E, To M, Khouri O, Nicolaides KH.
N Engl J Med 2008;358:1346-53. -
Cervical length and maternal factors in expectantly managed prolonged pregnancy: prediction of onset of labor and mode of delivery.
Rao A, Celik E, Poggi S, Poon L, Nicolaides KH.
Ultrasound Obstet Gynecol 2008;32:646-51.