aDepartment of Gastroenterology, University Hospital of Wales, Heath Park, Cardiff CF4 4XW, UK,
bDepartment of Medical Computing and Statistics, University of Wales College of Medicine, Cardiff, UK,
cDepartment of Gastroenterology, Llandough Hospital, Cardiff, UK,
dDepartment of Medicine, Derriford Hopital, Plymouth, UK,
eHeinrich Heine Universität, Dusseldorf, Germany(1998-04-01時点)
