1. The management of preterm labor;Goldenberg;Obstet Gynecol,2002
2. Epidemiology and causes of preterm birth;Goldenberg;Lancet,2008
3. 4 million neonatal deaths: when? where? why?;Lawn;Lancet,2005
4. Public Health Agency of Canada. Canadian Perinatal Health Report. 2008,2008
5. Neonatal morbidity according to gestational age and birth weight from five tertiary care centers in the United States, 1983 through 1986;Robertson;Am J Obstet Gynecol,1992