Journal Article 123 Incidence 37 Measurement 32 Research Methodology 32 Diseases 29 Developing Countries 25 Viral Diseases 21 plus ... Hiv Infections 15 Asia 12 Infections 12 Prevalence 12 Economic Factors 10 Research Support, Non-U.S. Gov't 10 Acquired Immunodeficiency Syndrome 9 Demographic Factors 9 Organization And Administration 9 Population 9 Africa 8 Family Planning 8 Incidence--changes 8 Programs 8 grazing incidence 8 incidence 8 Africa South Of The Sahara 7 Behavior 7 Contraception 7 Delivery Of Health Care 7 Health 7 Health Services 7 grazing-incidence X-ray diffraction 7 moins ...