Text and Data Mining valid from 2019-08-06
Received: 27 October 2018
Accepted: 27 June 2019
First Online: 6 August 2019
Ethics approval and consent to participate
: The present study was approved by the Ethical Committee at Faculty of Dentistry, Ain Shams University, Egypt.
: Not applicable.
: The authors declare that there are no competing interests in connection with this article.