TY - BOOK A1 - Gwatkin, D.R. A1 - Rutstein, S. A1 - Johnson, K. A1 - Suliman, E. A1 - Wagstaff, A. A1 - Amouzou, A. T1 - Socio-economic differences in health, nutrition, and population within developing countries: An overview Y1 - 2007 CY - Washington, D.C. PB - The World Bank ER -