Purde, M.-T., M. Baumann, U. Wiedemann, U. Nydegger, L. Risch, D. Surbek, and M. Risch. “Incidence of Preeclampsia in Pregnant Swiss women”. Swiss Medical Weekly, vol. 145, no. 3132, July 2015, p. w14175, doi:10.4414/smw.2015.14175.