[1] Hannover Med Sch, Dept Gastroenterol, D-3000 Hannover, Germany
[2] Inst Pomnik Centrum Zdrowia Dziecka, Klin Gastroenterol Hepatol & Imunol, Warsaw, Poland
[3] Univ Klin Freiburg, Med Klin & Poliklin, Freiburg, Germany
[4] Tel Aviv Med Ctr & Sch Med, Tel Aviv, Israel
[5] Univ Klin Kiel, Kiel, Germany
[6] Karolinska Univ Sjukhus Solna, Stockholm, Sweden
[7] Dr Falk Pharma GmbH, Klin Forsch, Freiburg, Germany
[8] Univ Munich, Klinikum Grosshadern, Med Klin & Poliklin, D-8000 Munich, Germany
[9] Univ Bonn, Med Klin, D-5300 Bonn, Germany
[10] Semmelweis Univ, Dept Internal Med 1, H-1085 Budapest, Hungary