Funding for this research was provided by:
the priming scientific research foundation for the junior researcherin Beijing Tongren Hospital, Capital Medical University (TRYY-KYJJ-2016-057)
Article History
Received: 21 December 2018
Accepted: 2 June 2019
First Online: 17 June 2019
Ethics approval and consent to participate
: The Ethical Committee of Beijing Tongren Hospital, Capital Medical University approved the study and written informed consent was obtained from all study participants.
: Not applicable.
: The authors declare that they have no competing interests.