Katon JG, Gray K, Callegari L, Gardella C, Gibson C, Ma E, Lynch KE, Zephyrin L. Trends in hysterectomy rates among women veterans in the US Department of Veterans Affairs. Am J Obstet Gynecol. 2017 Oct;217(4):428.e1-428.e11. doi: 10.1016/j.ajog.2017.05.0