[1] NHLBI, Cardiovasc & Pulm Branch, NIH, Bethesda, MD 20892 USA
[2] Univ Cincinnati, Dept Internal Med, Div Pulm Crit Care & Sleep Med, Cincinnati, OH USA
[3] Mem Sloan Kettering Canc Ctr, Dept Pathol, New York, NY 10021 USA
[4] Mayo Clin, Dept Pathol, Scottsdale, AZ USA
[5] Brigham & Womens Hosp, Dept Med, Div Pulm & Crit Care Med, Boston, MA 02115 USA
[6] Harvard Univ, Sch Med, Boston, MA USA