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Africa south of the Sahara refugee population Migrants demography developing country Population Dynamics Developing Countries Refugees Middle East war health service Needs Foreign Aid Food Supply housing international cooperation Kenya Arab Countries Health Services Needs and Demand catering service Political Factors--history Africa Northern Africa health services Article Ethiopia Africa, Northern migration Eastern Africa French Speaking Africa Somalia Djibouti Demographic Factors politics English Speaking Africa Emigration and Immigration Transients and Migrants Africa, Eastern Sudan