[1] UNIV CALIF LOS ANGELES,DEPT MED,LOS ANGELES,CA 90024
[2] AB HASSLE,GASTROINTESTINAL RES,S-43183 MOLNDAL,SWEDEN
[3] WESTERN GEN HOSP,MRC,HUMAN GENET UNIT,EDINBURGH EH4 2XU,MIDLOTHIAN,SCOTLAND
[4] HAMMERSMITH HOSP,IMPERIAL CANC RES FUND,LONDON W12 0NN,ENGLAND
[5] AB HASSLE,DEPT CLIN PHARMACOL & MED,S-43183 MOLNDAL,SWEDEN
[6] MED SCH HANNOVER,DEPT GASTROENTEROL & HEPATOL,HANNOVER,GERMANY
[7] UNIV GOTTINGEN,DEPT MED,DIV GASTROENTEROL & ENDOCRINOL,W-3400 GOTTINGEN,GERMANY