Received: 9 May 2017
Accepted: 6 June 2018
First Online: 6 July 2018
Ethics approved and consent to participate
: Study was reviewed by the Colorado Multiple Institutional Review Board, ID #12–0347. The Review Board provided a waiver of consent and approval for study since all data was previously collected for clinical purposes as part of routine healthcare and patients were given unique anonymous identifiers to reduce risk of breach of confidentiality.
: Not applicable.
: The authors declare they have no competing interest.
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