1. South Texas Veterans Health Care System and University of Texas Health San Antonio TX USA
2. Scottish Centre for Respiratory Research Dundee UK
3. School of Medicine University of Dundee, Ninewells Hospital and Medical School Dundee UK
4. Department of Pulmonary Medicine, Zhongshan Hospital Fudan University Shanghai China
5. Johns Hopkins University School of Medicine Baltimore MD USA
6. Vanderbilt University School of Medicine Nashville TN USA