[1] Univ Texas Hlth Sci Ctr San Antonio, Dept Med, San Antonio, TX 78229 USA
[2] Univ Texas Hlth Sci Ctr San Antonio, Div Pulm Dis Crit Care Med, San Antonio, TX 78229 USA
[3] Amer Coll Chest Phys, Northbrook, IL USA
[4] Amer Acad Nurse Practitioners, Austin, TX USA
[5] Univ Minnesota, Dept Family & Community Hlth, Minneapolis, MN USA
[6] Suburban Lung Associates, Elk Grove Village, IL USA
[7] Baylor Coll Med, Dept Med, Pulm Crit Care Div, Houston, TX 77030 USA