[1] METROHLTH MED CTR,DEPT MED,DIV GASTROENTEROL & HEPATOL,2500 METROHLTH DR,CLEVELAND,OH 44109
[2] VET AFFAIRS MED CTR,DIV GASTROENTEROL,MARTINEZ,CA 94553
[3] OREGON HLTH SCI UNIV,DEPT PHARMACOL,PORTLAND,OR 97201
[4] CASE WESTERN RESERVE UNIV,VET AFFAIRS MED CTR,CLEVELAND,OH 44106