Guan, Lingxia
Guo, Jing
Ban, Jinghao
Li, Gang
Tong, Juan
Chuan, Aiyun
Tian, Tian
Han, Bing
Xuan, Kun
Wang, Shengchao
Funding for this research was provided by:
Scientific Research Fund of National Health Commission of the People’s Republic of China (201502002)
National Natural Science Foundation of China (81701030)
Article History
Received: 5 March 2020
Accepted: 18 August 2020
First Online: 7 September 2020
Ethics approval and consent to participate
: The study was approved by the human subjects ethics board of the Chinese Stomatological Association, Beijing, China (approval no. 2014–003) and was conducted in accordance with the Helsinki Declaration of 1975, as revised in 2013. An informed consent was obtained verbally (approved by ethics board of the Chinese Stomatological Association) from each participant for data collection and clinical examination.
: Not applicable.
: The authors declare that they have no competing interests.