[1] Yale Univ, Med & Surg, Sch Med, New Haven, CT 06520 USA
[2] Univ Toronto, Paediat Med Pharmacol & Toxicol, Toronto, ON, Canada
[3] Univ Calif Los Angeles, Neurol, Los Angeles, CA USA
[4] Kings Coll Hosp London, Paediat Liver GI & Nutr Ctr, London, England
[5] Kings Coll Hosp London, MowatLabs, London, England
[6] Johns Hopkins Univ, Sch Med, Med, Baltimore, MD USA
[7] Yale New Haven Hosp, Food & Nutr Serv, New Haven, CT USA
[8] Vanderbilt Univ, Med Ctr, Pathol Immunol & Microbiol, Nashville, TN USA
[9] Salem Med Ctr, Internal Med, Heidelberg, Germany
[10] Yale Univ, Sch Med, Psychiat, New Haven, CT 06520 USA
[11] Yale Univ, Sch Med, 333 Cedar St,LMP 1080,POB 208019, New Haven, CT 06520 USA