Received: 13 August 2018
Accepted: 4 February 2019
First Online: 18 February 2019
Ethics approval and consent to participate
: The MUSC Institutional Review Board approved this retrospective study and the research followed the tenets of the Declaration of Helsinski (IRB Study #Pro00048917). The data requests were submitted through Services, Pricing, and Application for Research Centers (SPARC) at MUSC, and this process complied with the Health Insurance Portability and Accountability Act.
: Not applicable.
: The authors declare that they have no competing interests.
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