1. Division of Pulmonary, Allergy and Critical Care Medicine, Department of Medicine, University of Alabama at Birmingham, Birmingham, AL 35294, USA.
2. Department of Radiology, University of Alabama at Birmingham, Birmingham, AL 35233, USA.
3. Department of Surgery, University of Alabama at Birmingham, Birmingham, AL 35294, USA.
4. Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Worcester, MA 01605, USA.
5. Vanderbilt Lung Institute, Department of Medicine, Vanderbilt University Medical Center, Nashville, TN 37212, USA.
6. Baker Institute for Animal Health, College of Veterinary Medicine, Cornell University, Ithaca, NY 14853, USA.
7. Department of Dermatology, University of Alabama at Birmingham, Birmingham, AL 35294, USA.
8. Birmingham VA Medical Center, Birmingham, AL 35294, USA.