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Family PlanningFamily Planning WorkersFear of ComplicationsFemale SterilizationExcessive BleedingRapid Population GrowthHereditary DiseaseContraceptive MethodsCytotoxic DrugsReproductive AgeNorthern RegionWestern RegionEastern RegionLocal AnesthesiaLeydig CellsMainland ChinaEconomic FactorsNumber of CasesCentral RegionVasectomy