Developed Countries Journal Article Population 357 Demographic Factors 349 Population Dynamics 313 Europe 254 Research Methodology 174 Population Characteristics 162 Economic Factors 159 Americas 147 Mediterranean Countries 144 North America 141 Northern America 133 English Abstract 124 Southern Europe 123 Socioeconomic Factors 117 United States 114 Migration 105 Mortality 102 Italy 95 Western Europe 91 Fertility 86 Social Sciences 85 Demography 83 Age Factors 77 Geographic Factors 74 Developing Countries 73 Family And Household 73 Historical Demography 73 Nuptiality 62