Funding for this research was provided by:
National Natural Science Foundation of China (81701120)
National Key Development Plan of China (2016YFC0105900)
Text and Data Mining valid from 2019-12-01
Received: 3 April 2019
Accepted: 5 November 2019
First Online: 19 December 2019
Ethics approval and consent to participate
: The study will be conducted according to Good Clinical Practice Guidelines and the principles of the Declaration of Helsinki. Written informed consent will be obtained from each participant. The study protocol was approved by the Medical Ethics Committee Board of every center. To make any amendments to the protocol (protocol number: PINS-VFS-1601; date: 10 November 2016), approval will be sought from the Institutional Review Board of Tiantan Hospital. Informed consent must be provided in standard writing, and the investigators will elaborate the content to the participants. Informed consent will be provided by all participants, including their consent regarding the publication of the results to the investigators. Confidentiality will be ensured during all handling of the data. This study has been approved by Ethics Committee of Beijing Tian Hospital, Capital Medical University (number, QX2016–015-02).
: Not applicable.
: The authors declare that they have no competing interests.