1. Births, final data for 1999;Ventura;Natl Vital Stat Rep,2001
2. The Vermont–Oxford Network: evidence-based quality improvement for neonatology;Horbar;Pediatrics,1999
3. Vital Statistics of the United States. 1997, I: Natality, Third Release of Files. Washington, DC: National Center for Health Statistics; 2000. Tables 1–26.
4. Hospital and patient characteristics associated with variation in 28-day mortality rates for very low birth weight infants;Horbar;Pediatrics,1997
5. Improved outcome into the 1990s for infants weighing 500–1999 g at birth;Victorian Infant Collaborative Study Group;Arch Dis Child Fetal Neonatal Ed,1997