1. Center for Infectious Diseases; Kobe University Graduate School of Medicine; Kobe Japan
2. Department of Anatomical Pathology, Faculty of Medicine; Dr. Sardjito Hospital, Gadjah Mada University; Yogyakarta Indonesia
3. Department of Gastroenterology; Kobe University Graduate School of Medicine; Kobe Japan
4. Indonesia-Japan Collaborative Research Centre for Emerging and Re-Emerging Infectious Diseases; Institute of Tropical Disease, Airlangga University; Surabaya Indonesia
5. Department of Internal Medicine, Faculty of Medicine; Dr. Sardjito Hospital, Gadjah Mada University; Yogyakarta Indonesia