1. University of Mississippi Medical Center, Jackson, MS, USA, Jackson State University, Jackson, MS, USA, Duke University, Durham, NC, USA,
2. Wake Forest University School of Medicine, Winston-Salem, NC, USA
3. Duke University, Durham, NC, USA
4. University of Mississippi Medical Center, Jackson, MS, USA
5. University of Alabama Birmingham, Birmingham, AL, USA
6. University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
7. University of South Alabama, Mobile, AL, USA