Xie, A. S. http://orcid.org/0000-0003-2544-8277
Article History
Received: 13 August 2017
Accepted: 3 December 2018
First Online: 1 January 2019
Compliance with ethical standards
:
: There are not any potential conflicts of interest.
: This research involved no human participants and/or animals. So this article does not contain any studies with human participants or animals performed by any of the authors.
: This article has only one author, and there is no such thing as informed consent.