[1] Univ Genoa, DINOGMI, Genoa, Italy
[2] G Gaslini Childrens Hosp IRCCS, Pediat Surg Unit, Genoa, Italy
[3] G Gaslini Childrens Hosp IRCCS, Pediat Gastroenterol Unit, Genoa, Italy
[4] Univ Roma La Sapienza, Dept Pediat, I-00185 Rome, Italy
[5] IRCCS, Bambino Gesu Childrens Hosp, Surg & Digest Endoscopy Unit, Rome, Italy
[6] IRCCS Burlo Garofolo, Inst Maternal & Child Hlth, Gastroenterol Unit, Trieste, Italy
[7] Osped Civile Spirito Santo, Dept Pediat, Unit Pediat Gastroenterol & Digest Endoscopy, Pescara, Italy
[8] Univ Messina, Pediat Surg Unit, Dept Pediat Gynecol Microbiol & Biomed Sci, Messina, Italy
[9] Univ G dAnnunzio Chieti, Pediat Surg Unit, Chieti, Italy
[10] Univ Naples Federico II, Dept Translat Med Sci, Sect Pediat, Naples, Italy
[11] Univ Messina, IBD Unit Pediat Dept, Messina, Italy
[12] Univ Naples Fedrico II, Unit Gen Surg, Naples, Italy