http://reply.papertrans.cn/1/40/3916/3916-21.png
http://reply.papertrans.cn/1/40/3916/3916-22.png
Submitted on: 13 November 2009.
Revised on: 11 February 2010.
Accepted on: 04 March 2010.
___________________BMC Oral Health---BMC
Submitted on: 24 April 2019.
Revised on: 09 July 2019.
Accepted on: 03 September 2019.
___________________BMC Oral Health---BMC
http://reply.papertrans.cn/1/40/3916/3916-25.png
http://reply.papertrans.cn/1/40/3916/3916-26.png
http://reply.papertrans.cn/1/40/3916/3916-27.png
http://reply.papertrans.cn/1/40/3916/3916-28.png
http://reply.papertrans.cn/1/40/3916/3916-29.png
Submitted on: 23 December 2021.
Revised on: 24 February 2022.
Accepted on: 19 March 2022.
___________________BMC Oral Health---BMC