RT Journal Article SR Electronic T1 Use of Doppler ultrasonography to predict pre-eclampsia JF Canadian Medical Association Journal JO CMAJ FD Canadian Medical Association SP 53 OP 53 DO 10.1503/cmaj.1080039 VO 179 IS 1 A1 Agustín Conde-Agudelo, MD MPH A1 Marshall Lindheimer MD YR 2008 UL http://www.cmaj.ca/content/179/1/53.1.abstract