Text and Data Mining valid from 2019-10-08
Received: 20 August 2019
Accepted: 11 September 2019
First Online: 8 October 2019
Ethics approval and consent to participate
: The study was performed in accordance with the Declaration of Helsinki. It is a retrospective study and was approved by the School of Dentistry, Científica del Sur University.
: Not applicable
: The authors declare that they have no competing interests.