References
[1]. Allen, L. H. (2001). Biological mechanisms that might underlie iron's effects on fetal growth and preterm birth. Journal of Nutrition, 13, 581S-589S.
[2]. Beck, S., Wojdyla, D., Say, L., Betran, A.P., Merialdi, M., Requejo, J.H., et al. (2010). The worldwide incidence of preterm birth: a systematic review on maternal mortality and morbidity. The Bulletin of the World Health Organization, 88(1), 31–38.
[3]. Erickson, K., Thorsen, P., Chrousos, G., Grigoriadis, D. E., Khongsaly, O. N., McGregor, J., et al. (2001). Preterm birth: Associated neuroendocrine, medical, and behavioral risk factors. Journal of Clinical Endocrinology and Metabolism, 86, 2544-2552.
[4]. Giurgescu, C. (2009). Are maternal cortisol levels related to preterm birth? Journal of Obstetric, Gynecologic, & Neonatal Nursing, 38(4), 377-390.
[5]. Green, N. S., Damus, K., Simpson, J. L., Iams, J., Reece, E. A., Hobel, C. J., et al. (2005). Research agenda for preterm birth: Recommendations from the march of dimes. American Journal of Obstetrics and Gynecology, 19(3), 626-635.
[6]. Goldenberg, R. L., Culhane, J. F., Iams, J. D., & Romero, R. (2008). Epidemiology and causes of preterm birth. The Lancet, 37(9606), 75-84.
[7]. Ickovics, J. R., Kershaw, T. S., Westdahl, C., Magriples, U., Massey, Z., Reynolds, H., et al. (2007). Group prenatal care and perinatal outcomes: A randomized controlled trial. Obstetrics and Gynecology, 110(2), 330-339.
[8]. Latendresse, G. (2009). The interaction between chronic stress and pregnancy: Preterm birth from a biobehavioral perspective. Journal of Midwifery and Women's Health, 54(1), 8-17.
[9]. Lawn, J.E., Gravett, M.G., Nunes, T.N., Rubens, C., & Stanton, C. (2010). Global report on preterm birth and still birth (1 of 7): definitions, description of the burden and opportunities ti improve data. Biomedcentral Pregnancy and Childbirth, 10 (Suppl 1), 1471-2393.
[10]. Mathews, T.J., &MacDorman, M. F. (2007). Infant mortality statistics from the 2004 period linked birth/infant death data set. National vital statistics reports, 55(14). Retrieved October 10, 2009, from http://www.cdc.gov/ nchs/data/nvsr/nvsr57/nvsr57_02.pdf.
[11]. Rafati, S., Borna, H., Akhavirad, M. B., &Fallah, N. (2005). Maternal determinants of giving birth to low-birth-weight neonates. Archives of Iranian Medicine, 8(4), 277- 281.
[12]. Steer, P. (2005). The epidemiology of preterm labor. International Journal of Obstetrics and Gynecology- Supplements, 112(1), 1-3.
[13]. The World Bank (2008). Mortality rate, infant (per 1,000 live births). Retrieved November 21, 2009, from http://data.worldbank.org/indicator/SP.DYN.IMRT.IN/countri es/latest?display=default.