[1] Shanghai Jiao Tong Univ, Sch Med, Shanghai Childrens Med Ctr, Dept Gastroenterol, Shanghai, Peoples R China
[2] Shanghai Jiao Tong Univ, Shanghai Childrens Med Ctr, Sch Med, Child Hlth Advocacy Inst, Shanghai, Peoples R China
[3] Shanghai Jiao Tong Univ, Sch Med, Shanghai Childrens Med Ctr, Dept Dev & Behav Pediat, Shanghai, Peoples R China
[4] Univ Hong Kong, Li Ka Shing Fac Med, Sch Clin Med, Dept Paediat & Adolescent Med, Hong Kong, Peoples R China
[5] Hong Kong Childrens Hosp, Dept Paediat & Adolescent Med, Hong Kong, Peoples R China
[6] Univ North Carolina Chapel Hill, Inst Global Hlth & Infect Dis, Chapel Hill, NC USA
[7] London Sch Hyg & Trop Med, Fac Infect & Trop Dis, Clin Res Dept, London, England
[8] Xinhua Hosp, Minist Educ, Shanghai Key Lab Childrens Environm Hlth, Shanghai, Peoples R China