Funding for this research was provided by:
Ministry of Science and Technology of the People's Republic of China (No.2011BAI11B05)
Beijing Municipal Commission of Education (PXM2019_014226_000023)
Text and Data Mining valid from 2019-09-17
Received: 9 July 2019
Accepted: 6 September 2019
First Online: 17 September 2019
Ethics of approval and consent to participate
: The present study was approved by the Clinical Research Ethics Committee of Beijing Anzhen Hospital, Capital Medical University (No.: 2012001). Informed consent was exempt by the committee.
: Not applicable.
: The authors declare that they have no competing interests.