1. Mayo Clinic Alix School of Medicine, Mayo Clinic College of Science and Medicine, Scottsdale, Arizona, USA.
2. Division of Hematology and Oncology, Mayo Clinic Arizona, Phoenix, Arizona, USA.
3. Department of Biostatistics, Mayo Clinic Arizona, Scottsdale, Arizona, USA.
4. Department of Critical Care Medicine, Mayo Clinic Arizona, Phoenix, Arizona, USA.
5. Division of General Internal Medicine, Center for Palliative Medicine, Mayo Clinic Arizona, Phoenix, Arizona, USA.
6. Department of Health Policy and Administration, Pennsylvania State University, University Park, Pennsylvania, USA.