[1] Univ Calif San Francisco, Dept Psychiat, Neurogenet Lab, San Francisco, CA 94143 USA
[2] Univ Calif San Francisco, Ctr Liver, San Francisco, CA 94143 USA
[3] Wilhelmina Childrens Hosp, Lab Metab Dis, Utrecht, Netherlands
[4] Wilhelmina Childrens Hosp, Dept Pediat Gastroenterol, Utrecht, Netherlands
[5] Tohoku Univ, Sch Med, Dept Pediat, Sendai, Miyagi 980, Japan
[6] Our Ladys Hosp Sick Children, Natl Ctr Med Genet, Dublin 12, Ireland
[7] Univ Calif San Francisco, Sch Med, Dept Med, Div Gastroenterol, San Francisco, CA 94143 USA
[8] Univ Coll Dublin, Childrens Res Ctr, Dept Pediat, Dublin 2, Ireland
[9] Childrens Mem Hlth Inst, Warsaw, Poland
[10] Univ Turin, Ist Med Interna, Turin, Italy
[11] Tottori Univ, Fac Med, Dept Pediat, Yonago, Tottori 683, Japan
[12] Univ Modena, Div Gastroenterol, I-41100 Modena, Italy
[13] Rigshosp, Dept Hepatol, DK-2100 Copenhagen, Denmark
[14] Univ Texas, Med Branch, Dept Pathol, Galveston, TX 77550 USA