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Keywords:
Comparative StudiesData CollectionData SourcesDemographic FactorsDeveloped CountriesEconomic FactorsEuropeForeignersGeographic FactorsHuman ResourcesMediterranean CountriesNationalityOccupationsPlace Of BirthPopulationPopulation CharacteristicsResearch MethodologyResidence CharacteristicsSouthern EuropeSpainSpatial DistributionStudies