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2. Etiology and prevention of stillbirth;Fretts;Am J Obstet Gyncecol,2005
3. Centers for Disease Control and Prevention, NCHS, National Vital Statistics System: Vital statistics of the United States, vol. II, mortality, Part A; Infant mortality rates, fetal mortality rates, and perinatal mortality rates, according to race: United States, selected years 1950–1998. Public Health Service, Washington, DC, U.S. Govt. Printing Office.
4. Introduction,1982
5. Maternal mortality and perinatal mortality: definitions, data, and epidemiology;Friede,1985