1. Bethany Medical Center, Greensboro, NC, USA;
2. Department of Internal Medicine, Wake Forest School of Medicine, Winston-Salem, NC, USA;
3. Center College of Medicine, University of Tennessee Health Science, Memphis, TN, USA;
4. Department of Pathology, Wake Forest School of Medicine, Winston-Salem, NC, USA;
5. Department of Pulmonary and Critical Care, Wake Forest School of Medicine, Winston-Salem, NC, USA;
6. Department of Anesthesiology, Wake Forest School of Medicine, Winston-Salem, NC, USA