Article History
Received: 21 April 2020
Accepted: 20 June 2020
First Online: 28 June 2020
Compliance with ethical standards
:
: The authors declare no conflict of interest.
: All animal experiments were reviewed and approved by the Chengde Medical University Animal Care Committee (Approval No. CDMULAC-20180410016) and complied with the International Association for the Study of Pain (IASP) Guidelines for the Use of Animals in Research.