Text and Data Mining valid from 2019-08-13
Received: 6 April 2019
Accepted: 7 August 2019
First Online: 13 August 2019
Ethics approval and consent to participate
: The study was ethically approved by the Ethic Committee of the University of L’Aquila, Italy (Document DR206/2013). The treated subjects gave the consent to the analysis of their documentation for research purposes. The retrospective study was ethically approved by the Institution, the procedures were in accordance with the declaration of Helsinki and all the subjects signed a consent form.
: Not applicable.
: The authors declare that they have no competing interests.