1. Department of Medicine, Oregon Health & Science University, Portland, Oregon, USA.
2. Northwestern University, Feinberg School of Medicine, Chicago, Illinois, USA.
3. Department of Palliative Medicine and Supportive Care, Northwestern University, Feinberg School of Medicine, Chicago, Illinois, USA.
4. Department of Palliative Medicine, Medical Faculty, RWTH Aachen University, Aachen, Germany.