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Article History

Received: 17 December 2019

Revised: 26 April 2020

Accepted: 18 May 2020

First Online: 16 December 2020

COMPLIANCE WITH ETHICAL STANDARDS

: <i>Conflict of interest.</i> The authors declare that they have no conflict of interest.

: <i>Ethical approval.</i> All procedures involving animals and their care were conducted according to governmental guidelines on animal experimentation, namely, the National Institutes of Health’s “Principles of Laboratory Animal Care” and the “Guide for the Care and Use of Laboratory Animals.” The experiment was approved by Jianghan University experimental animal ethical review committee and the approval number is 2016100006.

: <i>Informed consent.</i> This article does not contain any studies involving human participants performed by any of the authors.

: <i>Availability of data and materials.</i> The data sets generated during the current study are available from the corresponding author on reasonable request.

: <i>Author’s contributions.</i> JZ was responsible for the study concept and design. XKG constructed the self-administration animal model. JZ and TTN drafted the manuscript. All authors critically reviewed content and approved the final version for publication.