3Yajun Y, N akayamaT. Effectiveness and safety of ritodrine hydroch loridefor the treatment of preterm labour: a system atic review [J]. Pharmacoepidemiol Drug Safe 2006, 15: 813.
4Yajun Y, Nakayama T. Effectiveness and safety of ritodrine hydrochloridefor the treatment of preterm labour:a systemat- ic review [ J ]. Pharmaeoepidemiol Drug Saf, 2006,15 : 813.
5Merrill L. Magnesium sulfate during anticipated preterm birth for infant neuroprotection [J]. Nurs Womens Health, 2013,17(1 ) :42-51.
6Yaju Y,Nakayama T.Effectiveness and safety of ritodrine hydrochloride for the treatment of preterm labour:a systematic review[J].Pharmacoepidemiol Drug Saf,2006,15(11):813-822.
