[1] Tulane Univ, Sch Med, Dept Med, Div Pulm & Crit Care, New Orleans, LA 70112 USA
[2] Tulane Univ, Sch Med, Southeast Louisiana Vet Healthcare Syst, Sect Pulm Dis Crit Care & Environm Med, 1430 Tulane Ave, New Orleans, LA 70112 USA
[3] Southeast Louisiana Vet Healthcare Syst, Dept Pathol, New Orleans, LA USA
[4] Tulane Univ, Sch Med, Southeast Louisiana Vet Healthcare Syst, 1430 Tulane Ave, New Orleans, LA 70112 USA