1. Department of Perinatology and Gynecology; National Cerebral and Cardiovascular Center; Osaka Japan
2. Department of Obstetrics and Gynecology; Mie University; Osaka Japan
3. Department of Obstetrics and Gynecology; Sakakibara Heart Institute; Tokyo Japan
4. Department of Cerebrovascular Medicine; National Cerebral and Cardiovascular Center; Suita Japan
5. Department of Neurology; National Cerebral and Cardiovascular Center; Suita Japan
6. Department of Neurosurgery; National Cerebral and Cardiovascular Center; Suita Japan
7. Advanced Medical Technology Development; National Cerebral and Cardiovascular Center; Suita Japan
8. Ohno Women's Clinic; Iwakura Japan