Sonographic early Foetal gender assignment: a longitudinal study in pregnancies after in vitro fertilization. Ultrasound Obstet Gynecol. June 2001, 17 (6): 513–6. PMID 11422974. doi:10.1046/j.1469-0705.2001.00421.x.
Sonographic early Foetal gender assignment: a longitudinal study in pregnancies after in vitro fertilization. Ultrasound Obstet Gynecol. June 2001, 17 (6): 513–6. PMID 11422974. doi:10.1046/j.1469-0705.2001.00421.x.