1. Department of Hematology, Osaka General Hospital of West Japan Railway Company, Osaka 545‑0053, Japan
2. Department of Urology, Minamiosaka Hospital, Osaka 559‑0012, Japan
3. Department of Pathology, Minamiosaka Hospital, Osaka 559‑0012, Japan
4. Department of Pathology, Osaka City General Hospital, Osaka 534‑0021, Japan