1. Department of Gastroenterology, Onomichi General Hospital, Onomichi, Hiroshima 722‑8508, Japan
2. Department of Surgery, Onomichi General Hospital, Onomichi, Hiroshima 722‑8508, Japan
3. Department of Pathology, Onomichi General Hospital, Onomichi, Hiroshima 722‑8508, Japan
4. Institute of Liver Studies, King's College Hospital, London SE5 9RS, UK