Funding for this research was provided by:
Natural Science Foundation of Beijing (7154196)
National Natural Science Foundation of China (81872676)
Beijing Hospitals Authority Youth Programme (QML 20181207)
Natural Science Foundation of Beijing Municipality (7192063)
Beijing Municipal Administration of Hospitals (XTYB201806)
Article History
Received: 10 August 2020
Accepted: 21 October 2020
First Online: 28 October 2020
Compliance with ethical standards
:
: The authors declare that they have no conflicts of interest.
: This study was approved by the Beijing Children’s hospital Ethics Committee (reference number 2017-k-84). The Review Board exempted the requirement for informed consent because this retrospective study only focused on the bacteria and did not affect the patients.