1. Department of Medicine, Columbia University Vagelos College of Physicians and Surgeons, New York, New York, USA.
2. School of Nursing, Columbia University, New York, New York, USA.
3. Department of Anesthesiology, Columbia University College of Physicians and Surgeons, New York, New York, USA.
4. Adult Palliative Care Service, Department of Medicine, Columbia University Irving Medical Center, New York, New York, USA.
5. Department of Sociomedical Sciences and Columbia University Mailman School of Public Health, New York, New York, USA.
6. Department of Epidemiology, Columbia University Mailman School of Public Health, New York, New York, USA.