*Correspondence author:
1.Zhiwei Liu MD, PhD, Department of Neonatology, International Peace
Maternity and Child Health Hospital, Shanghai Jiao Tong University
School of Medicine, Shanghai Key Laboratory of Embryo Original Disease,
Shanghai Municipal Key Clinical Specialty, Huashan Rd. 1961 Shanghai,
200030, China; Tel: +86 21 64070434. Fax: +86 21 64474645. Email:
liuzhiwei@hotmail.com.
2.Fang Chen, MD, PhD.Department of Urology, Shanghai Children’s
Hospital, Shanghai Jiao TongUniversity, 355 Luding Road, Shanghai,
200062, China; Department of Urology, Shanghai Sixth People’s Hospital,
Shanghai JiaoTong University, 600 Yishan Road, Shanghai, China;Shanghai
Eastern Institute of Urologic Reconstruction.E-mail:
doctorchenfang@126.com.
Funding : This work was supported by the National Key Research
and Development Program of China (2016YFC1000203), the National Natural
Science Foundation of China Grants (81974232),and the Shanghai
Municipal Commission of Health and Family Planning (2016ZB0102-02).
Acknowledgements: The authors thank the participating
parturients and their infants.
Ethics approval: Ethics approval and use of clinical data for
research purposes was granted by the Ethics Committees of the
International Peace Maternity and Child Health Hospital (GKLW 2017-101)
in 23rd August 2018.
Conflict of Interest: The authors declare that they have no
competing interests.