1. University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, North Carolina, USA.
2. UNC Palliative Care Program, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA.
3. Department of Pharmacy, University of North Carolina Hospitals and Clinics, Chapel Hill, North Carolina, USA.
4. Department of Emergency Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA.