3Skaznik WM,Czajkowski K,Kugaudo M,et al.Assessment of pregnancy and labour outcome and the condition of the newborn in primiparous women aged 35 and older[J].Ginekol Pol,2003,74(8):607.
4Ritchie LD,King JC.Dietary calcium and pregnancy induced hypertension:is there a relation[J].Am J Clin Nutr,2000,71(5suppl):1371.