1. Emory University School of Medicine, Atlanta, Georgia, USA.
2. Brown University, Providence, Rhode Island, USA.
3. Division of Palliative Medicine, Department of Family and Preventive Medicine, Emory University School of Medicine, Atlanta, Georgia, USA.
4. Department of Pediatrics, Emory University School of Medicine, Atlanta, Georgia, USA.
5. Department of Epidemiology, Rollins School of Public Health, Emory University, Atlanta, Georgia, USA.