[1] Vrije Unversiteit Brussel VUB, UZ Brussel, KidZ Hlth Castle, B-1090 Brussels, Belgium
[2] Paris Descartes Univ, Pediat Gastroenterol Dept, F-75006 Paris, France
[3] Necker Enfants Malades Hosp, AP HP, Pediat Gastroenterol Dept, F-750015 Paris, France
[4] Marcel Sembat Clin, F-92100 Boulogne, France
[5] King Faisal Specialist Hosp & Res Ctr, Pediat Dept, Sect Gastroenterol, POB 3354, Riyadh 11211, Saudi Arabia
[6] King Abdulaziz Hosp, Pediat Dept, Sect Allergy & Clin Immunol, Jeddah 22421, Saudi Arabia
[7] Alexandria Univ, Pediat Gastroenterol & Nutr Dept, Alexandria 21544, Egypt
[8] Ain Shams Univ, Fac Med, Pediat Gastroenterol & Endoscopy Dept, Cairo 11535, Egypt
[9] October 6 Univ, Fac Med, Giza 12511, Egypt
[10] Dar AlShifa Hosp, Pediat Gastroenterol Hepatol & Nutr Dept, Kuwait 13034, Kuwait
[11] Pediat Gastroenterol Dept, Mediclin Airport Rd, Abu Dhabi 48481, U Arab Emirates