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2. Recommandations pour la Pratique Clinique. Prise en charge de l’interruption volontaire de grossesse jusqu’à 14 semaines,2001
3. Ultrasound screening in the 2nd trimester. The pregnant woman’s background knowledge, expectations, experiences and acceptance;Larsen;Ultrasound Obstet. Gynecol.,2000
4. First trimester ultrasound screening. Carries ethical and psychological implications;Mc Fadyen;BMJ,1998
5. Attitudes and expectations of pregnant women to routine ultrasonography in early pregnancy [in Danish with English abstract];Qvist;Ugeskr Laeger,2002