Funding for this research was provided by:
Beijing Science and Technology Planning Project (D161100003816005)
Key Technologies Research and Development Program (2016YFC1301800)
Article History
Received: 12 January 2019
Revised: 8 June 2019
Accepted: 19 June 2019
First Online: 30 July 2019
Compliance with ethical standards
:
: The authors declare that they have no conflicts of interest.
: The study was approved by the Institutional Review Board of Beijing Tiantan Hospital (approval number KY2016-034-02).
: Written informed consent was obtained from the participants before recruitment, including their permission for the anonymous publication of their information and images in this study and other academic uses. For the participant under the age of 18 years or with limited capacity for civil conduct, written consent was obtained from at least one of their legal guardians.