1. Department of Obstetrics and Gynecology, Faculty of Medicine, Saga University, Saga, Japan.
2. Vitrigel Project Research Team, Institute of Agrobiological Sciences, National Agriculture and Food Research Organization, Tsukuba, Japan.
3. Department of Pathology and Microbiology, Faculty of Medicine, Saga University, Saga, Japan.
4. Biological Resources and Development, Analytical Research Center for Experimental Sciences, Saga University, Saga, Japan.
5. Department of Internal Medicine and Gastrointestinal Endoscopy, Faculty of Medicine, Saga University, Saga, Japan.
6. Department of Pathology, Takagi Hospital, Okawa, Japan.