[1] Staedt Klinikum, Dept Internal Med, Dessau, Germany
[2] Hosp Badalona Germans Trias & Pujol, Dept Gastroenterol, Badalona, Spain
[3] Univ Roma La Sapienza, Dept Gastroenterol 2, Rome, Italy
[4] Univ Lisbon, Fac Med, Ctr Nutr & Metab, P-1699 Lisbon, Portugal
[5] Charite, CCM, Dept Gastroenterol, Berlin, Germany
[6] Rigshosp, Clin Nutr Unit 5711, DK-2100 Copenhagen, Denmark