1. Ira Kodner Professor of Supportive Care, Division of Palliative Medicine, Department of Medicine, Goldfarb School of Nursing, Washington University, St. Louis, Missouri, USA.
2. Department of Biobehavioral and Health Sciences, School of Nursing, University of Pennsylvania, Philadelphia, Pennsylvania, USA.
3. Department of Biostatistics, Epidemiology and Informatics, Perelman School of Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA.
4. Division of Palliative Medicine, Department of Medicine, Washington University, St. Louis, Missouri, USA.