Journal Article 150 Diseases 139 Viral Diseases 132 Developing Countries 116 Hiv Infections--prevention and control 62 Acquired Immunodeficiency Syndrome--prevention and control 59 Hiv Infections 59 mehr ... Asia 52 Africa 51 Research Methodology 48 Acquired Immunodeficiency Syndrome 45 Africa South Of The Sahara 40 Economic Factors 40 Epidemics 40 Developed Countries 37 Behavior 34 Americas 32 Population 32 Measurement 31 Demographic Factors 30 Family Planning 30 English Speaking Africa 29 Contraception 28 Contraceptive Methods 26 Organization And Administration 26 Barrier Methods 25 North America 25 Southeastern Asia 24 Population Characteristics 23 Northern America 22 weniger ...