1. Department of Pulmonary and Critical Care Medicine, Mayo Clinic, Jacksonville, FL, USA
2. Department of Critical Care Medicine, Lexington Medical Center, West Columbia, SC, USA
3. Departments of Neurology and Palliative Care Medicine, Mayo Clinic, Jacksonville, FL, USA
4. Department of Palliative Care Medicine, Mayo Clinic, Jacksonville, FL, USA
5. Department of Quantitative Health Sciences, Mayo Clinic, Jacksonville, FL, USA
6. Department of Critical Care Medicine, Mayo Clinic, Jacksonville, FL, USA