1. Department of Neurology, Vagelos College of Physicians and Surgeons, Columbia University, New York, New York, USA.
2. Department of Medicine, Vagelos College of Physicians and Surgeons, Columbia University, New York, New York, USA.
3. Department of Obstetrics and Gynecology, Vagelos College of Physicians and Surgeons, Columbia University, New York, New York, USA.
4. Department of Epidemiology, Mailman School of Public Health, Columbia University, New York, New York, USA.