Chanderdeep Sharma, Soni A, Gupta A, Verma A, Verma S. Hydralazine vs nifedipine for acute hypertensive emergency in pregnancy: a randomized controlled trial. Am J Obstet Gynecol. 2017 Sep 1. pii: S0002-9378(17)30965-1. doi:10.1016/j.ajog.2017.08.018. 2017:217(6);687.e1–687.e6