1. Department of Biostatistics, Bioinformatics, and Epidemiology, Hollings Cancer CenterMedical University of South CarolinaP.O. Box 250835, 135 Cannon Street, Suite 303CharlestonSC29425USA
2. Josephine Ford Cancer CenterHenry Ford Health SystemOne Ford Place, 5CDetroitMI48202USA
3. South Carolina State UniversityOrangeburgSCUSA
4. Department of Biostatistics, Bioinformatics, and EpidemiologyMedical University of South Carolina135 Cannon Street, Suite 303CharlestonSC29425USA
5. Jesse Brown VA Medical CenterChicagoILUSA
6. VA Center for Management of Complex Chronic CareHinesILUSA
7. Sections of General Internal Medicine and Health Promotion Research, Department of MedicineUniversity of Illinois at ChicagoChicagoILUSA