1. University of California, Irvine Medical Center, Department of Emergency Medicine, Orange, California
2. University of California, Irvine Medical Center, Department of Internal Medicine, Orange, California
3. Memorial Care, Long Beach Medical Center, Department of Pulmonary and Critical Care Medicine, Long Beach, California; University of California, Irvine Medical Center, Department of Pulmonary and Critical Care Medicine, Orange, California
4. Memorial Care, Long Beach Medical Center, Department of Emergency Medicine, Long Beach, California