Received: 1 October 2019
Accepted: 4 February 2020
First Online: 18 March 2020
Ethics approval and consent to participate
: The research protocol was submitted to and approved by the Ethical Committee of the University of Medical Sciences, School of Dentistry, Havana, Cuba (prot. 013/2013).
: All the authors consent to publication.
: Alessandro Perini, Giada Ferrante, Stefano Sivolella, Joaquín Urbizo Velez, Franco Bengazi, and Daniele Botticelli declare that they have no competing interests.