Funding for this research was provided by:
National Natural Science Foundation of China (No. 81570891)
Beijing Natural Science Foundation (No. 7151003)
Advanced Health Care Professionals Development Project of Beijing Municipal Health Bureau (No. 2014-2-003)
Beijing Municipal Administration of Hospitals’ Ascent Plan (DFL20150201)
The Capital Health Research and Development of Special (2016-1-2051)
Beijing Municipal Administration of Hospitals Clinical Medicine Development of Special Funding Support (ZYLX201307)
Science & Technology Project of Beijing Municipal Science & Technology Commission (Z181100001818003, Z151100001615052)
Received: 19 May 2019
Accepted: 22 November 2019
First Online: 3 December 2019
Ethics approval and consent to participate
: This retrospective case series was approved by the ethics committee at Beijing Children’s Hospital and conducted in accordance with the principles of the Helsinki Declaration. Written informed consent was obtained from the parents of all patients before surgical treatment.
: All of the authors agreed to publish the article. We believe all identifying information has been appropriately anonymised and there are no identifying images used within the manuscript.
: The authors declare that they have no conflict of interest.