1. Department of Infectious Diseases, Respiratory and Digestive Medicine, Faculty of Medicine, University of the Ryukyus, Japan
2. Department of Obstetrics and Gynecology, Faculty of Medicine, University of the Ryukyus, Japan
3. Department of Pathology and Oncology, Faculty of Medicine, University of the Ryukyus, Japan
4. Department of Anesthesiology, Faculty of Medicine, University of the Ryukyus, Japan