Funding for this research was provided by:
Luzhou Municipal People's Government-Southwest Medical science and technology strategic cooperation projects (2017LZXNYD-T03)
Luzhou Municipal Science and Technology Bureau (2016-R-70(13/24))
Article History
Received: 4 September 2018
Accepted: 12 February 2019
First Online: 2 March 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: All procedures performed in the study were in accordance with the Ethics Committee of the Affiliated Hospital of Stomatology Southwest Medical University Certificate (contract grant 20180314001) and with the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards.