Funding for this research was provided by:
National Natural Science Foundation of China (81670879)
Article History
Received: 20 August 2019
Accepted: 16 December 2019
First Online: 8 January 2020
Ethics approval and consent to participate
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional research committee and with the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards. The protocol was approved by the Ethics Committee of Peking Union Medical College Hospital (Beijing, China) with reference number ZS-1125. Written informed content was obtained from all patients before enrollment.
: Not applicable.
: The authors declare that they have no competing interests.