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APA Citation
Hoopmann, M., Sonek, J., Esser, T., Bilardo, C. M., Wagner, P., Abele, H., & Kagan, K. O. (2016). frontal space distance in facial clefts and retrognathia at 11–13 weeks' gestation. Ultrasound in obstetrics & gynecology, 48, 171–176. http://access.bl.uk/ark:/81055/vdc_100035003704.0x000035