Song, Lixin http://orcid.org/0000-0001-8286-319X
Guan, Ting
Guo, Peiran
Keyserling, Thomas C.
Van Houtven, Courtney
Tan, Xianming
Article History
Received: 11 May 2019
Accepted: 13 July 2019
First Online: 22 August 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: This study involved secondary database analysis of a publicly available database, and hence, formal consent is not required.