1. Department of Pharmacy, Peking University Third Hospital, Beijing, China;
2. College of Pharmacy, University of Nebraska Medical Center, Omaha, NE, USA;
3. Ralph H. Johnson Veterans Administration Medical Center, Charleston, SC, USA;
4. Division of Pulmonary Diseases and Critical Medicine, Department of Medicine, University of North Carolina, Chapel Hill, NC, USA;
5. Division of Pulmonary, Critical Care, Allergy and Sleep Medicine, Department of Medicine, Medical University of South Carolina, Charleston, SC, USA