Text and Data Mining valid from 2018-08-13
Received: 12 April 2018
Accepted: 10 July 2018
First Online: 13 August 2018
Ethics approval and consent to participate
: The study was conducted in the Department of Orthodontics and Dentofacial Orthopedics at Damascus University. Ethical approval was obtained from the Ethics Committee at the Ministry of Higher Education in Syria.
: The authors declare that they have no competing interests.
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