Siregar, D. I. S., M. F. G. Siregar, G. A. Siregar, and S. M. Warli. “Von Willebrand Factor Gene Polymorphism in Preeclampsia Pregnant at Medan, Indonesia”. Open Access Macedonian Journal of Medical Sciences, vol. 9, no. A, Nov. 2021, pp. 1047-51, doi:10.3889/oamjms.2021.7732.