1. Department of Clinical Cell BiologyChiba University Graduate School of Medicine, 1-8-1 Inohana, Chuo-ku, Chiba 260-8670, Japan; Department of Molecular and Tumor Pathology, Chiba University Graduate School of Medicine, 1-8-1 Inohana, Chuo-ku, Chiba 260-8670, Japan
2. Department of Clinical Cell BiologyChiba University Graduate School of Medicine, 1-8-1 Inohana, Chuo-ku, Chiba 260-8670, Japan
3. Department of Molecular and Tumor PathologyChiba University Graduate School of Medicine, 1-8-1 Inohana, Chuo-ku, Chiba 260-8670, Japan
4. Division of Clinical ImmunologyThe Institute of Medical Science, The University of Tokyo, 4-6-1 Shiroganedai, Minato-ku 108-8639, Tokyo, Japan