Journal Article 783 Behavior 267 Developing Countries 185 Population 165 Demographic Factors 160 Asia 125 Population Dynamics 120 plus ... Economic Factors 118 Family Planning 112 Psychological Factors 101 Population Characteristics 91 Developed Countries 81 Health 80 Diseases 73 Research Methodology 73 Research Support, Non-U.S. Gov't 73 Fertility 72 Americas 71 Contraception 70 Organization And Administration 69 behavior 66 Age Factors 63 North America 63 Reproductive Behavior 62 Socioeconomic Factors 62 Programs 60 Education 57 Viral Diseases 55 Sex Behavior 51 Youth 51 moins ...