7[5]Horbar JD,et al.Antenatal corticosteroid treatment and neonatal outcomes for infants 501 to 1500g in the Vermont-Oxford trials net-work.Am J Obstet Gynecol,1995,173(3):275
8[6]Albert R,John C,Hobbins.Medicine of the fetus and mother.2nd ed.Philadelphia:Lippincott-Raven Publishers,1999.1683
9Barkovich AJ. Pedicatric Neuroimaging[M]. 3th ed. Philadelphia,Lippincott Willams and Wilkins, 2003.183.
10Johnsong AJ, Lee BCP, Lin W. Echoplanar diffusion-weighted imaging in neonates and infants with suspected hypoxic-ischernic injury[J]. AJR, 1999,172:219-226.