1. Department of Surgical PathologyAichi Medical University Hospital Aichi Japan
2. The Research Program for Intractable Disease by Ministry of Health, Labor and WelfareJapanese Pathology Study Group of IgG4‐related Disease Tokyo Japan
3. Department of Anatomic PathologyKurashiki Central Hospital Okayama Japan
4. Institute of Liver StudiesKing's College Hospital & King's College London London UK
5. Department of Pathology and Laboratory MedicineNagoya University Hospital Aichi Japan
6. Department of PathologyOkayama University Graduate School of Medicine Okayama Japan
7. The Third Department of Internal Medicine, Division of Gastroenterology and HepatologyKansai Medical University Osaka Japan
8. Division of PathophysiologyOkayama University Graduate School of Health Sciences Okayama Japan