Funding for this research was provided by:
NIH (U01AI069923, R01AI131771)
Received: 2 May 2019
Accepted: 17 December 2019
First Online: 30 December 2019
Ethics approval and consent to participate
: Institutional review board approval was obtained from each site and from the Vanderbilt University Institutional Review Board. All CCASAnet sites received a waiver of consent from local IRBs for this re-use of existing clinical data. All data received by the CCASAnet data coordinating center at Vanderbilt University was first de-identified by each local site prior to transfer to maintain confidentiality.
: Not applicable
: The authors declare that they have no competing interests.