1. Department of Internal Medicine (Section on Pulmonary and Critical Care Medicine), Winston-Salem, NC 27157
2. Department of Medicine, Mayo Clinic Jacksonville, Jacksonville, FL 32224
3. General Clinical Research Center Wake Forest University School of Medicine, Winston-Salem, NC 27157
4. Department of Biochemistry, Winston-Salem, NC 27157
5. Department of Physiology/Pharmacology, Winston-Salem, NC 27157