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To examine the relationship between first-trimester hemoglobin (Hb) concentration and risk of low birth weight (LBW), preterm birth and small for gestational age (SGA).Data were obtained from a population-based prenatal care program in China. A total of 88,149 women who delivered during 1995–2000 and had their Hb measured in the first trimester were selected as study subjects.The prevalence of anemia...
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