Article History
Received: 16 June 2020
Accepted: 25 July 2020
First Online: 4 August 2020
Compliance with ethical standards
:
: All the authors declare that he has no conflict of interest. Ethical approval. This article does not contain any studies with human participants or animals performed by any of the authors.
: The study was approved by research ethics committee of The Central Hospital of Enshi Tujia and Miao Autonomous Prefecture, Enshi, Hubei, China under approval number AHS-111-C52-2019.