1. Medical Research Council Center for Regenerative Medicine; The University of Edinburgh; Edinburgh bioQuarter Edinburgh United Kingdom
2. Division of Gastroenterology and Hepatology, Graduate School of Medical and Dental Science; Niigata University; Niigata Japan
3. Institute for Cellular Chemistry; Hannover Medical School; Hannover Germany
4. Department of Hepatology and Gastroenterology; Juntendo Shizuoka Hospital; Izunokuni City Japan