1. Division of Pulmonary Medicine, Department of Biochemistry and Molecular Biology, Mayo Clinic Arizona, Scottsdale, Arizona, USA;
2. Division of Hematology/Oncology, Department of Biochemistry and Molecular Biology, Mayo Clinic Arizona, Scottsdale, Arizona, USA;
3. Department of Medicine, Guizhou Provincial People's Hospital, Guiyang, Guizhou, China; and
4. Vermont Lung Center, Department of Medicine, University of Vermont, Burlington, Vermont, USA