1. Department of Internal Medicine, Division of General Internal Medicine, Geriatrics and Palliative Care, Medical University of South Carolina, Charleston, South Carolina, USA.
2. Department of Internal Medicine, South University College of Nursing and Public Health, Savannah, Georgia, USA.
3. Department of Internal Medicine, Division of Medical Oncology, Duke Cancer Institute, Duke Fuqua School of Business, Duke University, Durham, North Carolina, USA.
4. Department of Internal Medicine, Duke University School of Medicine, Durham, North Carolina, USA.