[1] Mayo Clin, Dept Pulm & Crit Care Med, 4500 San Pablo Rd S, Jacksonville, FL 32224 USA
[2] Lexington Med Ctr, Dept Crit Care Med, W Columbia, SC USA
[3] Mayo Clin, Dept Neurol, Jacksonville, FL 32224 USA
[4] Mayo Clin, Dept Palliat Care Med, Jacksonville, FL 32224 USA
[5] Mayo Clin, Dept Quantitat Hlth Sci, Jacksonville, FL 32224 USA
[6] Mayo Clin, Dept Crit Care Med, Jacksonville, FL 32224 USA