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virus infection HIV Infections refugee Human immunodeficiency virus infection population movement population demography Migrants developing country Population Dynamics Developing Countries Refugees travel health service Acquired Immunodeficiency Syndrome Disease national border mobility control human rights health Border Crossing disease diffusion Viral Diseases Diseases Virus Diseases Africa health services Article migration legal aspect international migration Demographic Factors Emigration and Immigration Transients and Migrants Delivery of Health Care AIDS general aspects of disease acquired immune deficiency syndrome population migration health care delivery