International migration: a global challenge.
D003710:Demography; D004467:Economics; D004641:Emigration and Immigration; D006285:Health Planning; D009934:Organization and Administration; D011153:Population; D011157:Population Dynamics; D011158:Population Growth; D012036:Refugees; D012106:Research; D014171:Transients and Migrants
Demographic Factors; Economic Factors; International Migration; Labor Migration; Migrants; Migration; Multiregional Analysis; Organization And Administration; Population; Population Dynamics; Population Growth; Program Design; Programs; Refugees; Research Methodology; Summary Report; World