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2. Gestational age at birth and mortality in young adulthood;Crump;JAMA,2011
3. Committee on Understanding Preterm Birth and Assuring Healthy Outcomes, Institute of Medicine. Preterm birth: causes, consequences, and prevention,2006
4. Preterm delivery;Slattery;Lancet,2002
5. Epidemiology and causes of preterm birth;Goldenberg;Lancet,2008