Funding for this research was provided by:
Michael and Susan Dell Foundation (None)
St. David's Medical Foundation (None)
Received: 26 December 2018
Accepted: 7 May 2019
First Online: 29 May 2019
Ethics approval and consent to participate
: All procedures in this study were approved by the University of Texas Health Science Center’s Institutional Review Board (HSC-SPH-13-0107 and HSC-SPH-13-0108) and the appropriate school district review boards. Individual level data were collected from participants and their children after informed consents were obtained.
: Our manuscript does not contain identifiable data from any individual.
: The authors declare that they have no competing interests.
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