1. Pulmonary and Critical Care Service, Department of Medicine, and
2. Pulmonary Disease Clinic, Wilford Hall Ambulatory Surgical Center, Joint Base San Antonio–Lackland, Texas; and
3. Pulmonary/Critical Care Service, David Grant USAF Medical Center, Travis Air Force Base, California
4. Graduate Medical Education, San Antonio Military Medical Center, Joint Base San Antonio–Fort Sam Houston, Texas