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Article History

Received: 8 May 2018

Accepted: 29 June 2018

First Online: 23 July 2018

Ethics approval and consent to participate

: The procedures were approved by the Internal Review Board (IRB) of the Post-Graduate School of Orthodontics, University of Ferrara, Ferrara, Italy (Prot. #032_2016).

: A consent for publication was signed by each participant, and all the documents are kept in the orthodontic department of Ferrara University.

: The authors declare they have no competing interests.

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