[1] Massachusetts Gen Hosp, Gastrointestinal Unit, MGH Crohns & Colitis Ctr, Boston, MA 02114 USA
[2] Harvard Univ, Sch Med, Boston, MA USA
[3] Atlanta Gastroenterol Associates, Atlanta, GA USA
[4] Elan Pharmaceut Inc, San Francisco, CA USA
[5] LLC, Niecko Hlth Econ, Escondido, CA USA
[6] Elan Pharmaceut Ltd, Pharmacoecon, Dublin, Ireland