Funding for this research was provided by:
Construction of Key Laboratory (Cultivation) of Chinese Academy of Medical Sciences (2019PT310025)
Beijing Municipal Science & Technology Commission (Z171100001017213)
Text and Data Mining valid from 2020-04-25
Received: 24 December 2019
Accepted: 26 March 2020
First Online: 25 April 2020
Ethics approval and consent to participate
: The study protocol conforms to the ethical guidelines of the 1975 Declaration of Helsinki and was approved by the ethics committee of Fuwai Hospital. Informed consent was obtained from each patient.
: Consent for publication was obtained from all the authors.
: The authors declare that they have no competing interests.