Received: 7 February 2018
Accepted: 8 August 2018
First Online: 22 August 2018
: The authors declare that they have no competing interests.
: This study was approved by the institutional review board of the MNG-HA in Riyadh, Saudi Arabia (Ref. # RC09/079). Consent to participate was obtained from the parents/guardians of the child participants, and the IRB approved obtaining it verbally.
: Not applicable
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