[1] Univ N Carolina, Chapel Hill, NC 27515 USA
[2] Hosp Clin Barcelona, Liver Unit, Barcelona, Spain
[3] Millennium Pharmaceut Inc, Cambridge, MA USA
[4] Hosp Clin Barcelona, Pathol Unit, Barcelona, Spain
[5] Hosp Clin Barcelona, Internal Med Unit, Barcelona, Spain
[6] Hosp Clin Barcelona, Hormonal Unit, Barcelona, Spain