[1] FREE UNIV AMSTERDAM,DEPT GASTROENTEROL,1007 MC AMSTERDAM,NETHERLANDS
[2] FREE UNIV AMSTERDAM,INST HUMAN GENET,1007 MC AMSTERDAM,NETHERLANDS
[3] FREE UNIV AMSTERDAM,DEPT PATHOL,1007 MC AMSTERDAM,NETHERLANDS
[4] STATE UNIV LEIDEN,MED CTR,DEPT GASTROENTEROL,2312 AV LEIDEN,NETHERLANDS
[5] SOPHIA ZIEKENHUIS,DEPT INTERNAL MED,ZWOLLE,NETHERLANDS