Funding for this research was provided by:
National Natural Science Foundation of China (81803035, 81703036)
Natural Science Foundation of Hunan Province (2019JJ50932)
Received: 29 May 2020
Accepted: 3 September 2020
First Online: 14 September 2020
Ethics approval and consent to participate
: The authors are accountable for all aspects of the work and for ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved. No ethics approval was required for this review article that did not involve patients or patient data.
: This manuscript has been read and approved by all the authors to publish and is not submitted or under consideration for publication elsewhere.
: We declare no conflicts of interest.