Vial, Y., Tran, C., Addor, M.-C. and Hohlfeld, P. 2001. Screening for fetal malformations: performance of routine ultrasonography in the population of the Swiss Canton of Vaud. Swiss Medical Weekly. 131, 3334 (Aug. 2001), 490–494. DOI:https://doi.org/10.4414/smw.2001.09789.