1. Centro Studio Fegato and Dipartimento BBCM, University of Trieste, Via Giorgieri 1, I-34127 Trieste, Italy
2. Research Service, DVA Lakeside Medical Center and GI/Hepatology Division, Northwestern University Medical School, Chicago, IL 60611, U.S.A.
3. School of Pharmacy, University of Wisconsin, Madison, WI 53706, U.S.A.