1. Department of Primary Care, McDonald Army Health Center , Fort Eustis, VA , USA
2. Department of Family Medicine and Population Health, Virginia Commonwealth University School of Medicine , Richmond, VA , USA
3. Department of Neurology, Tufts University School of Medicine , Boston, MA , USA
4. Virginia Institute of Marine Science, William & Mary , Gloucester Point, VA , USA
5. Comprehensive Smoking Treatment Program, Perelman School of Medicine, University of Pennsylvania , Philadelphia, PA , USA