[1] Univ Virginia, Hlth Sci Ctr, Div Pulm & Crit Care Med, Charlottesville, VA USA
[2] Univ Virginia, Hlth Sci Ctr, Div Gen Med, Charlottesville, VA USA
[3] Univ Virginia, Hlth Sci Ctr, Dept Internal Med, Charlottesville, VA USA
[4] Univ Virginia, Hlth Sci Ctr, Dept Radiol, Charlottesville, VA USA