4Aladangady N, McHugh S, Aitchison TC, et al.Infants" blood volume in a controlled trial of placental transfusion at preterm delivery[J].Pe- diatrics, 2006,117( 1 ) :93-98.
5Mercer JS,Vohr BR,McGrath MM,et al.Delayed cord clamping in very preterm infants reduces the incidence of intraventricular hemor- rhage and late-onset sepsis:a randomized,controlled trial [J].Pedi- atrics, 2006,117(4): 1235-1242.
6Andersson O,Hellstrom-Westas L,Andersson D,et al.Effect of de- layed versus early umbilical cord clamping on neonatal outcomes and iron status at 4 months:a randomised controlled trial [J].BMJ, 2011,343:7157.
7Capasso 1,, Raimondi F, Capasso A, et al.Early cord clamping protects at-risk neonates from polycythemia [J].Biol Neonate, 2003,83 (3) : 197-200.
8Mercer JS.Current best evidence: a review of the literature on umbili- cal cord elamping[J].J Midwifery Womens Health, 2001,46 (6) : 402- 414.
