Role of ultrasound in the evaluation of first-trimester pregnancies in the acute setting
Ultrasonography. 2020;39(2):178-189 
First trimester diagnosis of monoamniotic twin pregnancies
Ultrasound in Obstetrics and Gynecology. 2000;16(3):223-225
Doppler ultrasonographic evaluation of abnormal pregnancies in the first trimester
Journal of Clinical Ultrasound. 1990;18(6):497-501
OP24.10: Placental activity during first trimester is increased in first pregnancies
Ultrasound in Obstetrics and Gynecology. 2010;36(S1):124-124
First-trimester, three-dimensional transvaginal ultrasound volumetry in normal pregnancies and spontaneous miscarriages
Ultrasound in Obstetrics and Gynecology. 2002;19(6):575-579
OP19.09: Do first trimester βHCG levels have a predictive role in pregnancy outcome for singleton pregnancies?
Ultrasound in Obstetrics & Gynecology. 2013;42(s1):103-104
EP21.27: The role of first trimester ultrasound markers in early prediction of specific complications in monochorionic twin pregnancies
Ultrasound in Obstetrics & Gynecology. 2019;54(S1):376-376
P06.13: Evaluation for clinical effectiveness of the first trimester fetal heart screening in Korean setting
Ultrasound in Obstetrics & Gynecology. 2014;44(S1):216-217
OC08.01: Evaluating the ultrasound diagnostic criteria for non-viable first trimester pregnancies
Ultrasound in Obstetrics & Gynecology. 2017;50:14-14
Multicenter study of first-trimester screening for trisomy 21 in 75 821 pregnancies: results and estimation of the potential impact of individual risk-orientated two-stage first-trimester screening
Ultrasound in Obstetrics and Gynecology. 2005;25(3):221-226