1. Division of Hospital Internal Medicine, Mayo Clinic, Rochester, MN, USA
2. Division of Pulmonary and Critical Care Medicine, Mayo Clinic, Rochester, MN, USA
3. Mayo Clinic Robert D. and Patricia E. Kern Center for the Science of Healthcare Delivery, Mayo Clinic, Rochester, MN, USA
4. Division of Biomedical Statistics and Informatics, Mayo Clinic, Rochester, MN, USA
5. Division of General Internal Medicine, Mayo Clinic, Rochester, MN, USA