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Authors
Shafer, Alan
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Article History
First Online: 21 January 2019
Compliance with Ethical Standards
:
: The author received no funding for this study and has no conflict of interest to declare.
: All research was conducted in accordance with the ethical standards of the institutional review board and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. Data for this study was reviewed and approved by the Texas Department of State Health Services Institutional Review Board #2. Studies using only pre-existing administrative data do not require formal consent.
