[1] Univ Med Ctr Utrecht, Pathol Dept H04 2 25, NL-3508 GA Utrecht, Netherlands
[2] Univ Porto, Inst Mol Pathol & Immunol, IPATIMUP, P-4100 Oporto, Portugal
[3] Hosp Sao Joao, Fac Med, Oporto, Portugal
[4] Adelaide & Meath Hosp, Dept Gastroenterol, Dublin, Ireland
[5] Univ Amsterdam, Acad Med Ctr, Dept Pathol, NL-1105 AZ Amsterdam, Netherlands