Liu, Chunyan
Qiao, Xing
Zhang, Shilong
Ma, Wensheng
Wang, Wen
Ge, Xiaolei
Hu, Xiaoying
Kang, Wenjing
Lu, Haiyan
Article History
Received: 4 May 2019
Accepted: 26 November 2019
First Online: 27 February 2020
Compliance with ethical guidelines
:
: C. Liu, X. Qiao, S. Zhang, W. Ma, W. Wang, X. Ge, X. Hu, W. Kang and H. Lu declare that they have no competing interests.
: This study was approved by the Ethics Committee of Stomatological Hospital of Hebei Medical University No. [2014] 005.