9Joseph KS, Fahey J, Shankardass K, et al. Effects of socioeconomic position and clinical risk factors on spontaneous and iatrogenic preterm birth[J]. BMC Pregnancy Childbirth, 2014,14 : 117.
8Fiona LR,Williams GJ,Mires CB,et al.Serum Thyroid Hormones inPreterm Infants:Associations with sostnatal illnesses and drug usage[J].J Clin Endocr Metab,2005,90(8):4599-4606.
9Kantor MJ,Leef KH,Bartoshesky L.Admission thyroid evaluation invery-low-birth-weight infants:Association with death and severe in-traventricular hemorrhage[J].Thyroid,2003,13(10):965-969.
10Leviton A,Paneth N,Reuss MI,et al.Hypothyroxinemia of pre-ma-turity and the risk of cerebral white matter damage[J].Pediatr,1999,134(6):706-711.