1. Division of Pulmonary and Critical Care MedicineUniversity of CaliforniaIrvineCAUSA
2. Division of Pulmonary and Critical Care MedicineUniversity of CaliforniaLos Angeles David Geffen School of MedicineLos AngelesCAUSA
3. Division of Pulmonary and Critical Care MedicineWest Los Angeles Veterans Affairs Medical CenterLos AngelesCAUSA
4. Department of Pathology and Laboratory MedicineUniversity of CaliforniaLos Angeles David Geffen School of MedicineLos AngelesCAUSA
5. Department of Radiological SciencesUniversity of CaliforniaLos Angeles David Geffen School of MedicineLos AngelesCAUSA
6. Division of Pulmonary and Critical Care MedicineOlive View‐UCLA Medical Center