1. Department of Medicine, Section of Geriatrics and Palliative Medicine, Baylor College of Medicine, Houston, Texas, USA.
2. Department of Palliative and Supportive Care, Cleveland Clinic, Cleveland, Ohio, USA.
3. Adult Palliative Care Service, Department of Medicine, Columbia University Irving Medical Center, New York, New York, USA.
4. Division of Pulmonary and Critical Care Medicine, McGovern Medical School, The University of Texas Health Science Center at Houston, Houston, Texas, USA.
5. Division of Geriatric and Palliative Care Medicine, McGovern Medical School, The University of Texas Health Science Center at Houston, Houston, Texas, USA.
6. Department of Psychiatry and Behavioral Sciences, Memorial Sloan Kettering Cancer Center, New York, New York, USA.
7. Advanced Cardio-Pulmonary Therapeutics and Transplantation, McGovern Medical School, The University of Texas Health Science Center at Houston, Houston, Texas, USA.