1. Department of Immunology, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan.
2. Department of Clinical Pathology, Kagoshima Kousei-Ren Hospital, Kagoshima, Japan.
3. Department of Clinical Pathology, Kagoshima City Hospital, Kagoshima, Japan.
4. Department of Surgery, Kagoshima City Hospital, Kagoshima, Japan.
5. Department of Obstetrics, Kagoshima City Hospital, Kagoshima, Japan.
6. The Center for Advanced Biomedical Sciences and Swine Research, Kagoshima University, Kagoshima, Japan.