References
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- Gortmaker , Steven L. , Arthur , Sobol , Clark , Colleen C. , Walker , Deborah K. and Geronimus , Arline T. 1985 . The survival of very low birth weight infants by level of hospital of birth: A population study of perinatal systems in four states. Amer. Jo. Obstet . Gynecol , 152 ( 5 ) : 517 – 524 .