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WikiPedia: Sinh_non http://www.diseasesdatabase.com/ddb10589.htm http://www.emedicine.com/ped/topic1889.htm http://www.icd9data.com/getICD9Code.ashx?icd9=644 http://www.icd9data.com/getICD9Code.ashx?icd9=765 http://iom.edu/~/media/Files/Report%20Files/2006/P... http://www.nichd.nih.gov http://www.nichd.nih.gov/ http://www.nichd.nih.gov/health/topics/preterm/con... http://www.nichd.nih.gov/health/topics/preterm/con... http://www.nichd.nih.gov/health/topics/preterm/con...