1. Division of Pulmonary and Critical Care Medicine, Department of Medicine, David Geffen School of Medicine at UCLA, Los Angeles, California
2. Department of Pathology, David Geffen School of Medicine at UCLA, Los Angeles, California
3. Department of Radiological Sciences, UCLA Medical Center, Los Angeles, California
4. Division of Cardiology, Department of Medicine, David Geffen School of Medicine at UCLA, Los Angeles, California