rui-nan zhang shanghai key laboratory of children’s digestion and nutrition, department of gastroenterology, xinhua hospital, shanghai jiao tong university school of medicine, shanghai, china qin pan shanghai key laboratory of children’s digestion and nutrition, department of gastroenterology, xinhua hospital, shanghai jiao tong university school of medicine, shanghai, china zheng zhang shanghai key laboratory of children’s digestion and nutrition, department of gastroenterology, xinhua hospital, shanghai jiao tong university school of medicine, shanghai, china hai-xia cao shanghai key laboratory of children’s digestion and nutrition, department of gastroenterology, xinhua hospital, shanghai jiao tong university school of medicine, shanghai, china feng shen shanghai key laboratory of children’s digestion and nutrition, department of gastroenterology, xinhua hospital, shanghai jiao tong university school of medicine, shanghai, china jian-gao fan shanghai key laboratory of children’s digestion and nutrition, department of gastroenterology, xinhua hospital, shanghai jiao tong university school of medicine, shanghai, china; shanghai key laboratory of children’s digestion and nutrition, department of gastroenterology, xinhua hospital, shanghai jiao tong university school of medicine, shanghai, china. tel/fax: +86-2125077340

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