Funding for this research was provided by:
Key projects in the National Science & Technology Pillar Program (2015BAI09B01)
Natural Science Foundation of Beijing Municipality (7132027)
Beijing Municipal Natural Science Foundation (7164240)
Received: 25 March 2018
Accepted: 13 August 2018
First Online: 21 August 2018
Ethics approval and consent to participate
: This study was in compliance with the Helsinki Declaration and was approved by the Human Research Ethics Committee of Beijing CDC. Written informed consent for sample collection in this study was received from the patient’s guardian.
: Not applicable.
: The authors declare that they have no competing interests.
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