1Stefos T, Plachouras N, Sotiriadis A, et al. Routine obstetrical ultrasound at 18-22 weeks: our experience on 7,236 fetuses[J]. J Matern Fetal Med,1999,8(2):64-69.
2Levine D, Goldstein RB, Cadrin C. Distention of the fetal duodenum: abnormal finding[J]? J Ultrasound Med,1998,17 (4):213-215.
3Mckenna KM, Goldstein RB, Stringer MD. Small or absent fetal stomach:prognostic significance[J]. Radiology,1995,197(3):729-733.
4Pekindil G, Varol F, Yuce MA, et al. The fetal stomach circumference/abdominal circumference ratio:a possible parameter in assessing fetal stomach size[J]. Yonse Med J,1998,39(3):222-228.