1 From the Department of Neurology (A.L.-G.), Los Angeles Medical Center, Southern California Permanente Medical Group, Los Angeles, CA; Department of Clinical Science (A.L.-G.), Kaiser Permanente Bernard J. Tyson School of Medicine, Pasadena, CA; and Division of Maternal Fetal Medicine (I.I.I.), Department of Obstetrics and Gynecology, Stanford University, Palo Alto, CA.