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Article History

Received: 7 May 2018

Accepted: 24 July 2018

First Online: 1 August 2018

Ethics approval and consent to participate

: After providing complete description about the study, we obtained written informed consent from the parents of all subjects. The study was approved by the Ethical Committee of the Hospital Consortium Policlinico of Bari, Italy.

: All parents of the participants gave written consent to publish all data reported in this and other publications arising from study.

: The authors declare that they have no competing interests.

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