TY - JOUR AU - Westergaard, H B; Langhoff-Roos, XXX; Lingman, G TI - A critical appraisal of the use of umbilical artery Doppler ultrasound in high risk pregnancies: use of meta-analyses in evidence- based obstetrics JO - Ultrasound Obstet Gynecol VL - 17 PY - 2001 DO - 10.1046/j.1469-0705.2001.00415.x L3 - PubMed-ID: 11422966 SP - 466 EP - 476 N1 - et al. ER -