1 Section of Palliative Care, Department of Medicine, Dartmouth Hitchcock Medical Center, Lebanon, New Hampshire, USA.
2 Geisel School of Medicine at Dartmouth, Lebanon, New Hampshire, USA.
3 Division of Palliative Medicine, Department of Family and Preventive Medicine, Emory University School of Medicine, Atlanta, Georgia, USA.
4 Section of Palliative Care and Medical Ethics, Department of Medicine, Palliative Care Research Center, University of Pittsburgh School of Medicine, University of Pittsburgh Medical Center Health System Palliative and Supportive Institute, Pittsburgh, Pennsylvania, USA.