1. Division of Pulmonary and Critical Care, Department of Medicine, Loma Linda University, Loma Linda, CA, USA
2. Department of Emergency Medicine, Loma Linda University, Loma Linda, CA, USA
3. School of Medicine, Loma Linda University, Loma Linda, CA, USA
4. Division of Critical Care, Department of Anesthesia, Loma Linda University, Loma Linda, CA, USA