Transients and MigrantsEmigration and ImmigrationAnimal MigrationEmigrants and ImmigrantsSurinameRescue WorkChinaAgricultureMexicoMyanmarMoroccoTajikistanRefugeesRural PopulationMoscowKuwaitAcculturationAfrica, NorthernPopulation DynamicsNetherlands AntillesBirdsSingle PersonUrban PopulationFlight, AnimalTurkeyExtramarital RelationsHealth Services AccessibilityCultural CharacteristicsSocioeconomic FactorsHuman MigrationCross-Sectional StudiesSeasonsSongbirdsPeruUSSRHospitals, MunicipalPrevalenceNorth CarolinaLatin AmericaCentral AmericaSexual BehaviorMutationHIV InfectionsHealth Knowledge, Attitudes, PracticeThailandSomaliaRisk FactorsUrban HealthSocial DiscriminationEurope, EasternGeographyQuestionnairesAsia, Southeastern