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Article History

Received: 16 September 2019

Accepted: 10 December 2019

First Online: 21 December 2019

Compliance with ethical standards

:

: The authors declare that they have no conflict of interest.

: The present study was approved by both Ethics Committees of the Lebanese University (#76/2017) and Saint-Joseph University of Beirut (#USJ-2017-143).

: All parents or guardians of the participating children were informed about the study before their enrolment and they gave voluntary consent.