[1] Shanghai Jiao Tong Univ, Shanghai Childrens Hosp, Shanghai Inst Med Genet, Sch Med, Shanghai 200040, Peoples R China
[2] Shanghai Jiao Tong Univ, Sch Med, Inst Med Sci, Shanghai 200040, Peoples R China
[3] Minist Hlth China, Key Lab Embryo Mol Biol, Shanghai, Peoples R China
[4] Univ Penn, Sch Med, Dept Pathol & Lab Med, Philadelphia, PA 19104 USA