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Maternal serum level of manganese, single nucleotide polymorphisms, and risk of spontaneous preterm birth: A nested case-control study in China

GeneticsReproductive HealthGenetic EpidemiologyGynecologyMaternal HealthPregnancyPreterm BirthSpontaneous Preterm BirthMaternal-fetal MedicinePublic HealthMedicineReproductive EpidemiologyMaternal Serum LevelWomen's HealthHigh-risk PregnancySingle Nucleotide Polymorphisms