[1] Med Univ Warsaw, Dept Paediat, Zwirki & Wigury 63A, PL-02091 Warsaw, Poland
[2] Univ Naples Federico II, Dept Translat Med Sci, Sect Paediat, Naples, Italy
[3] Umea Univ, Dept Clin Sci, Pediat, Umea, Sweden
[4] Univ Zagreb, Childrens Hosp Zagreb, Sch Med, Zagreb, Croatia
[5] Univ JJ Strossmayer Sch Med Osijek, Osijek, Croatia
[6] Univ Foggia, Dept Med & Surg Sci, Pediat Sect, Foggia, Italy
[7] Ulm Univ, Ulm, Germany
[8] Hop Robert Debre, AP HP, Dept Pediat Gastroenterol & Nutr, Paris, France
[9] Univ Childrens Hosp Ljubljana, Univ Med Ctr Ljubljana, Dept Gastroenterol Hepatol & Nutr, Ljubljana, Slovenia
[10] Univ Insubria, F Del Ponte Hosp, Dept Pediat, Varese, Italy
[11] Tel Aviv Univ, Inst Gastroenterol Nutr & Liver Dis, Sackler Fac Med, Schneider Childrens Med Ctr, Tel Aviv, Israel
[12] Univ Amsterdam, Amsterdam UMC, Amsterdam, Netherlands
[13] Vrije Univ Amsterdam, Emma Childrens Hosp, Paediat Neonatol, Amsterdam Reprod & Dev, Amsterdam, Netherlands
[14] Vrije Univ Brussel, UZ Brussel, KidZ Hlth Castle, Brussels, Belgium
[15] Ben Gurion Univ Negev, Fac Hlth Sci, Beer Sheva, Israel