[1] Sichuan Univ, West China Second Hosp, Dept Pediat, Chengdu, Peoples R China
[2] Sichuan Univ, Minist Educ China, Key Lab Birth Defects & Related Dis Women & Chil, Chengdu, Peoples R China
[3] Sichuan Univ, West China Second Univ Hosp, Ctr Translat Med,Minist Educ, Key Lab Birth Defects & Related Dis Women & Child, Chengdu, Peoples R China