1. Orthopaedic Surgery, University of California San Diego School of Medicine, La Jolla, United States
2. Department of Medicine, Division of Pulmonary and Critical Care Medicine, University of California San Diego School of Medicine, La Jolla, United States
3. Medicine and Radiology, University of California San Diego, La Jolla, United States
4. Medicine, Division of Pulmonary and Critical Care Medicine, University of California San Diego, La Jolla, United States