[1] Univ Munich, Dr von Haunersches Kinderspital, D-80337 Munich, Germany
[2] Univ Toronto, SickKids Hosp, Div Gastroenterol Hepatol & Nutr, Toronto, ON, Canada
[3] Univ Alberta, Dept Med, Edmonton, AB, Canada
[4] Childrens Ctr Digest Healthcare, Atlanta, GA USA
[5] Our Ladys Hosp Sick Children, Childrens Res Ctr, Dublin, Ireland
[6] Queen Fabiola Childrens Hosp, Brussels, Belgium
[7] Queen Marys Hosp Children, Carshalton, Surrey, England
[8] Univ Vermont, Dept Pediat, Burlington, VT USA
[9] Karolinska Univ Hosp, Div Paediat, Stockholm, Sweden
[10] Emory Univ, Dept Pathol & Lab Med, Atlanta, GA 30322 USA
[11] Fac Libre Med, St Antoine Pediat Clin, Lille, France
[12] Hosp Pediat Mexico City, Ctr Med Nacl Siglo XXI, Mexico City, DF, Mexico
[13] Hop Pellegrin, Bacteriol Lab, F-33076 Bordeaux, France
[14] Univ Novara, Pediat Clin, Novara, Italy