3Kurjak A, Stanojevic M, Azumendi G, et al. The potential of fourdimensional (4D)uhrasonography in the assessment of fetal awareness[J]. J Perinat Med, 2005,33 ( 1 ) : 46-53.
4Fleischer AC, Andreotti RF. Color Doppler sonography in obstetrics and gynecology[J]. Expert Rev Med Devices, 2005,2 (5) : 605-611.
5Brinkley JF, McCallum WD, Muramatsu SK, et al. Fetal weight estimation from lengths and volumes found by three-dimensional ultrasonic measurements [J]. J Ultrasound Med,2008,3(4):163-168.
6Yang PY, Wu JL, Yeh GP, et al. Prenatal diagnosis of persistent right umbilical vein using three dimensional sonography with power Doppler[J]. Taiwan J Obstet Gy necoi,2007,46(1) :43.
7DiPietro JA,Costigan KA, Nelson P, et al. Fetal respon ses to induced maternal relaxation during pregnancy[J]. Biol Psychol, 2008,77 ( 1 ):11-19.
8DeMaio M, Magann EF. Exercise and pregnancy[J]. J Am Acad Orthop Surg, 2009,17(8):1781-1783.
