3Olivennes F, Kadhel P, Rufat P, et al. Perinatal outcome of twin pregnancies obtained after in vitro fertilization: comparison with twin pregnancies obtained spontaneously or after ovarian stimulation. Fertil Steril , 1996,66:105-109.
4乐杰.妇产科学（第5版）[M].北京:人民卫生出版社,2002.112.
5Rahman A, Iqbal Z, Bunn Jet al. Impact of maternal depres- sion on infant nutritional status and illness: a cohort study [J] . Archives of General Psychiatry, 2004, 61 (9) : 946.
6Emma R, Sherry G, Tamara W et al. Antenatal risk factors for postpartum depression : a synthesis of recent literature [ J] . General Hosnital Psychiatry. 2004. 26 (4): 289.
