1. Palliative Care Program, Department of Medicine, University of Pennsylvania Perelman School of Medicine, Philadelphia, PA, USA
2. Department of Internal Medicine, Yale School of Medicine, New Haven, CT, USA
3. Palliative Care Program, Rush Medical College, Chicago, IL, USA
4. Section of Palliative Care, Duke University School of Medicine, Durham, NC, USA
5. Section of Supportive and Palliative Medicine, Department of Medicine, UT Southwestern Medical School, Dallas, TX, USA