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Pietersma, C. et al. (n.d.). OC07.01: *Periconceptional maternal smoking and delayed embryonic morphological development according to the Carnegie stages. Ultrasound in obstetrics & gynecology. p. 18. [Online].
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Pietersma, C. et al. (n.d.). OC07.01: *Periconceptional maternal smoking and delayed embryonic morphological development according to the Carnegie stages. Ultrasound in obstetrics & gynecology. p. 18. [Online].