Funding for this research was provided by:
Scientific Research Common Program of Beijing Municipal Commission of Education (KM201810025001)
Basic Clinical Collaboration Foundation of Capital Medical University (17JL26)
Received: 2 December 2019
Accepted: 6 December 2019
First Online: 8 January 2020
Ethics approval and consent to participate
: Written informed consents and the approval (IACUC: AEEI-2017-128) of the ethical committee of Capital Medical University were obtained according to the principles of the Declaration of Helsinki.
: Not applicable.
: The authors declare that they have no competing interests.