When one and one aren't two.
D002140:California; D014487:Centers for Medicare and Medicaid Services, U.S.; D003625:Data Collection / Q000379:methods*; D005260:Female; D006744:Hospital Bed Capacity, 100 to 299; D006748:Hospital Departments / Q000592:standards*; D006801:Humans; D007226:Infant Mortality / Q000706:statistics & numerical data*; D007231:Infant, Newborn; D008428:Maternal Mortality / Q000706:statistics & numerical data*; D009775:Obstetrics and Gynecology Department, Hospital / Q000592:standards*; D011247:Pregnancy; D012307:Risk Factors; D014481:United States