Funding for this research was provided by:
Capital Health Research and Development of Special (2016-2-40114)
Public Welfare Scientific Research Project of China (201402012)
CAMS Central Public Welfare Scientific Research Institute Basal Research Expenses to HW (2016ZX310182-1)
CAMS Initiative for Innovative Medicine (2016-I2M-1-008)
Received: 16 November 2019
Accepted: 3 April 2020
First Online: 12 May 2020
Ethics approval and consent to participate
: The protocol of this study was approved by the Local Ethics Committee of the Peking Union Medical College Hospital (Protocol number: ZS-1465), and written informed consent was obtained from the parents of the participants prior to the study. The healthy controls signed informed consents form to their company and their data is open to the researchers who worked with them.
: Not applicable.
: The authors declare that they have no competing interests.