Funding for this research was provided by:
Xi’an Jiaotong University (XJTU1AF2016LSL-017)
Received: 1 February 2019
Accepted: 10 December 2019
First Online: 2 January 2020
Ethics approval and consent to participate
: This study was approved by the Ethical Committee of the First Affiliated Hospital of Xi’an Jiaotong University in Xi’an, China (XJTU1AF2016LSL-017). The central ethics committee has approved our study for the various centers. This study was registered with the clinical trials database Clinical Trials.gov, under the number NCT02899169. The informed consent form must be signed by the participants or their representatives, and the date must be included. The signed informed consent form will be preserved by researchers and participants independently. The informed consent form preserved by the researchers will be made available to project managers for monitoring, auditing, and inspection. We will obtain informed consent from all participants in the study.
: Not applicable.
: The authors declare that they have no competing interests.