Kohei Morita1,2, Kumiko Mito1,3, Toshiro Niki1, Noriyoshi Fukushima1. 1. Department of Pathology, Jichi Medical University, Shimotsuke-shi, Tochigi, Japan. 2. Department of Diagnostic Pathology, Nara Medical University School of Medicine, Kashihara, Nara, Japan. 3. Department of Internal Medicine, Toho University Ohashi Medical Center, Tokyo, Japan.