Article History
Received: 1 November 2019
Revised: 15 February 2021
Accepted: 25 February 2021
First Online: 8 June 2021
Declarations
:
: The authors declare that they have no conflict of interest.
: The research upon which this article is based received retrospective approval from the University of Oklahoma Institutional Review Board. It was classified as Exempt as no identifiable information was provided. Approval Letter is submitted with supplemental materials.
: All individual participants included in the study provided informed consent by completion of the voluntary survey and returning it at their expense in 2000 or 2001 or by clicking through the consent statement with the online version of the survey completed in 2012. Data from these surveys was provided to the lead author without identifying information and was approved for retrospective analysis by the OU IRB.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.