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Article History

Received: 16 January 2018

Accepted: 23 October 2018

First Online: 19 November 2018

Ethics approval and consent to participate

: This study conformed to the guidelines set forth in the Declaration of Helsinki and was approved by the institutional research committee of Hospital La Princesa code number 2828A (Spain). The parents of participating children gave informed written consent and the participating children gave verbal assent prior to data collection.

: Not Aplicable.

: The authors declare that they have no competing interests.

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