1 Division of Pulmonary, Allergy and Sleep Medicine, Mayo Clinic, Jacksonville, FL, USA; Division of Critical Care Medicine, Mayo Clinic, Jacksonville, FL, USA. Electronic address: Helgeson.scott@mayo.edu.
2 Division of Pulmonary and Critical Care Medicine, Mayo Clinic, Rochester, MN, USA.
3 Division of Pulmonary, Allergy and Sleep Medicine, Mayo Clinic, Jacksonville, FL, USA; Division of Critical Care Medicine, Mayo Clinic, Jacksonville, FL, USA.
4 Division of Pulmonary, Allergy and Sleep Medicine, Mayo Clinic, Jacksonville, FL, USA.