Funding for this research was provided by:
Natural Science Foundation of Inner Mongolia (2018MS08105)
National Natural Science Fund (No. 81460145)
Received: 29 September 2018
Accepted: 24 June 2019
First Online: 27 June 2019
Ethics approval and consent to participate
: This research was performed in accordance with the Declaration of Helsinki and approved by the Clinical Research Ethics Committee of the Affiliated Hospital of Inner Mongolia Medical College. Each participant provided written informed consent.
: Not applicable.
: The authors declare that they have no conflict of interest.