1. College of Dentistry, University of Illinois Chicago, 801 S. Paulina St., Chicago, IL 60612, USA
2. School of Dentistry, University of Maryland, 650 W. Baltimore St., Baltimore, MD 21201, USA
3. School of Public Health, University of Illinois Chicago, 1603 W. Taylor St., Chicago, IL 60612, USA
4. Project Brotherhood, 1510 E. 55th Street, P.O. 15282, Chicago, IL 60615, USA
5. University of Illinois Cancer Center, 818 S. Wolcott St., Chicago, IL 60612, USA
6. Department of Head & Neck Surgery & Communications Sciences, School of Medicine, Duke University, Durham, NC 27710, USA
7. Duke Cancer Institute, Duke University, Durham, NC 27705, USA