Received: 9 May 2017
Accepted: 10 January 2018
First Online: 29 January 2018
Ethics approval and consent to participate
: All the subjects were assented, and consent was obtained from at least one parent. The study was approved by the Office of Responsible Research Practices, OSU (IRB 2009B0396).
: Consent for publication was included as part of the IRB consent form and has been obtained from all the subjects.
: The authors declare that they have no competing interests.
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