1. Department of Obstetrics and Gynecology, Faculty of Medicine, Oita University, Yufu, Oita 879‑5593, Japan
2. Department of Anesthesiology and Intensive Care Medicine, Faculty of Medicine, Oita University, Yufu, Oita 879‑5593, Japan
3. Department of Neurology, Faculty of Medicine, Oita University, Yufu, Oita 879‑5593, Japan