Contributors
Every
authors had contribution to this research. Zhihua Li planned and
organized the study. Zhen Sui evaluated the clinical manifestations of
the cases. Yinong Xie and Tingting Yuan performed ultrasonography of the
fetus. Hongzhou Liu collated the experimental data. Lina Ding performed
studies about molecular genetics, analyzed the data and wrote the
manuscript. All authors read and agree to the final manuscript.