6Poets CF,Sens B. Changes in intubation rates and outcome of very low birth weight infants: a population-based study[J].Pediatrics, 1996, 98 : 24.
7Jonsson B, Katz-Salamon M,Faxelius G, et al. Neonatal care of very- low-birthweight infants in special-care units and neonatal intensive- care units in Stockholm. Early nasal continuous positive airway pres- sure versus mechanical ventilation;gains and losses[J]. Acta Pediatr Suppl, 1997,419:4.
8Dani C, Bertini G, Reali MF,et al. Prophylaxis of patent ductus arteriosus with ibuprofen in preterm infants. Acta Pediatr,2000,89:1369-1374.
9Varvariqou A, Bardin CL, Chemtob S,et al. Early ibuprofen administration to prevent patent ductus arteriosus in premature newborn infants. JAMA, 1996,275 : 539-544.
10Meek JH, Tyszczuk L, Elwell CE, et al. Low cerebral blood flow is a risk factor for severe intraventricular haemorrhage.Arch Dis Child Fetal Neonatal Ed, 1999,81: F15-18.