TY - JOUR A1 - Singh, G.K. A1 - Kogan, M.D. T1 - Persistent socioeconomic disparities in infant, neonatal, and postneonatal mortality rates in the United States, 1969–2001 Y1 - 2007 DO - 10.1542/peds.2005-2181 VL - 119 IS - 4 ER -