1. Department of Emergency Medicine, Loma Linda University School of Medicine, Loma Linda, California, USA.
2. Pulmonary & Critical Care, VA Loma Linda Healthcare System, Loma Linda, California, USA.
3. Department of Medicine, Loma Linda University School of Medicine, Loma Linda, California, USA.
4. Cardiology, St. Charles Health System, Bend, Oregon, USA.
5. Riverside University Healthcare System Medical Center, Moreno Valley, California, USA.