1. Departments of Pathology and Histotechnology, Tohoku University Graduate School of Medicine, Sendai, Japan
2. Department of Disaster Obstetrics and Gynecology, International Research Institute of Disaster Science, Tohoku University, Sendai, Japan
3. Departments of Obstetrics and Gynecology, Tohoku University Graduate School of Medicine, Sendai, Japan
4. Department of Pathology, Tohoku University Hospital, Sendai, Japan
5. Departments of Anatomic Pathology, Tohoku University Graduate School of Medicine, Sendai, Japan