1. Department of Pulmonary and Critical Care Medicine, Chinese PLA General Hospital The Eighth Medical Center, Chinese PLA General Hospital, Beijing 100093, China
2. Department of the First Internal Medicine, The Hubei Armed Police Corps Hospital, Wuhan, Hubei 430061, China
3. Department of Pulmonary and Critical Care Medicine, The Second Medical Center and National Clinical Research Center for Geriatric Diseases, Chinese PLA General Hospital, Beijing 100853, China
4. Department of Health Management, The Second Medical Center and National Clinical Research Center for Geriatric Diseases, Chinese PLA General Hospital, Beijing 100853, China
5. Division of Pediatric Immunology, Allergy and Rheumatology, Joe DiMaggio Children's Hospital, Hollywood, FL 33021, USA
6. Division of Rheumatology, Allergy and Clinical Immunology, University of California, Davis, Davis, CA 95616, USA.