Received: 21 December 2017
Accepted: 2 July 2018
First Online: 10 July 2018
Ethics approval and consent to participate
: The study was approved by the Institutional Review Board (IRB) at University of Texas Medical Branch, Galveston, TX. The need for written consent was waived by the IRB. Verbal parental assent was obtained prior to enrolling infants in the study.
: Not applicable
: The authors declare that they have no competing interests.
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