1. Division of Pulmonary and Critical Care, Massachusetts General Hospital, Boston, Massachusetts, USA
2. Department of Environmental Health, Harvard T.H. Chan School of Public Health, Boston, Massachusetts, USA
3. Harvard Medical School, Boston, Massachusetts, USA
4. Shanghai Putuo District People’s Hospital, Shanghai, China
5. Division of Pulmonary and Critical Care Medicine, Brigham and Women’s Hospital, Boston, Massachusetts, USA