1. Birth counts: statistics of pregnancy and childbirth;McFarlane,2000
2. Standards for hospitals providing neonatal intensive care;British Association of Perinatal Medicine,1996
3. Report of the Working Group on Neonatal Intensive Care to CSAG,1995
4. Perinatal and neonatal mortality: second report,1980
5. UK Neonatal Intensive Care Services in 1996;Tucker;Arch Dis Child Fetal Neonatal Ed,1999