1. School of Nursing, Duke University , Durham, NC , USA
2. Durham VA Health Care System , Durham, NC , USA
3. School of Medicine, Duke University , Durham, NC , USA
4. Neurology Department, Duke University School of Medicine , Durham, NC , USA
5. MS Center of Excellence, Durham VA Medical Center , Durham VA , USA
6. Department of Psychiatry and Behavioral Sciences, Duke University School of Medicine , Durham, NC , USA
7. VA Mid-Atlantic Mental Illness Research, Education, and Clinical Center (MIRECC) , Durham, NC , USA